i really appreciate this - in my 4th week of a level chemistry and this was exactly what i need!! definitely coming back here for my mocks, thank you for your hard work!! :)
This video has helped me out immensely, I've been struggling with the IUPAC nomenclature for years, but it's finally making sense! Much love from Nigeria!
Thank you so much for this video. I’m actually using this for my BMAT preparation without learning organic chemistry properly in class and I understand a lot better now. And yes a big thank once again. :)
I think there's an error at the end of the video. The first one should be an aldehyde rather than a carboxylic acid given its RCHO formula. Other than that, wonderful video! Thanks for your instruction!
I'm not quite sure I understood the part about the consonants. What exactly is a consonant, is it any non vowel character? When does the naming convention of not having two consonants together or two vowels together become relevant?
Yes, a consonant is any non-vowel letter. It's relevant when you take the first part of a name (that tells you chain length) e.g. ethane and then add a different functional group e.g. nitrile. Ethanenitrile is correct because e-n is vowel-consonant. The most common error would be to not include the e before the 'n' and you'd end up with consonant consonant If it was an alcohol functional group it becomes ethanol. We drop the e to prevent it being e-o in other words vowel-vowel.
Thank you so much for me how to name them because I'm really struggling with the naming in my year 1 A- level because I get confused with the naming as my teacher got further deep into the topic of organic chemistry. And after watching your video, it really help me to clear all the confusion :D
THANK YOU so much for the great explanation. I am currently taking Ib chemistry hl , and watching this video has helped me to a great extent. I have a question, How do I figure out which of these functional groups are branches, for example 46:00
Thank you for the feedback 😀 I'm really glad it's useful! When you have got 2 functional groups the one with the lower priority is considered to be a branch. So alcohol would become hydroxy and amine would be Amino. To decide on priority you generally look for number of bonds. So nitrile with a triple bond is highest, aldehyde and carboxylic acids with double bonds are high. Amine, halogen and alcohol are all low. The one exception I can think of is ethenol which is able to retain both traditional FG name styles
Thank you so much for helping. I’m preparing for CIE A levels from Bangladesh and found your videos extremely helpful. I really appreciate your hardwork. You are a living legend sir! ❤️❤️❤️
GOD BLESS YOU SIR!!! this video was a really big life saver u have no idea how much this helped me understand this topic! im a private a level student and my personal chem tutor was very fast on this topic and i couldnt understand a thing, it was really fustrating me out becuase i thought org chem is gonna be impossible for me to understand before my May exams, but thank God i found ur channel!! this lesson was actually intresting and honestly not that hard as long as i practice doing these everday! :) huge thank u again!
37:36 Sir doesn't an amine need two hydrogens bonded to the nitrogen? Why would this still be classified as an amine when it just has two methyl groups bonded to the nitrogen? 42:24 This confused me a bit, but basically the higher priority group will get the suffix (ending) and the lower priority gets the prefix (starting) ?
Really an amine is a nitrogen connected to a carbon chain with single bonds. That nitrogen could be connected to 1 C (primary amine) or 2C or 3C (secondary or tertiary amines)
For the last example at 47:50, you say we have to make sure vowels are not next to each other in the case of ethenol - but right next to this example you have aminoethanal? And there was also aminoethanoic acid earlier in the video! Why are those vowels not separated?
54:41 , the top left functional group is aldehyde not a carboxylic acid right? since it doesnt have a COOH but only COH . the answer would be 3-hydroxybutanal ??
28:13 Sir would this be the case when naming the compound too? (That fluoro would always come before iodo when naming because F comes before I in the alphabet?) From watching the video I'm seeing that when it comes to numbering the compound we always give priority to the functional group of the compound, for eg the OH of an alcohol or the double bond in an alkene but when it comes to naming we start with the alkyl groups (if there is any) and give priority to the alphabetical order of the 1st letter of the alkyl group (but the di. tri doesn't get priority)
Correct on the di-/tri- etc. Essential to include, but no alphabetical influence. All the branches should be in alphabetical order, butyl- chloro- etc Functional group carbon is C1 😀
Dear Teacher, thank you so much for the video. For the example of -amine on 37:47, methylamine means that changing the methane to methyl before the amine. Can I use methanamine that using the rule (48:11) of dropping the vowel letter of prefix before a vowel beginning suffix.
You're very welcome! Unfortunately, no. You can't do that for amines. You need to use methyl/ethyl etc. There is a family of chemicals that works like that, eg. Propanamide, and so to do that for amines would be too close to that. Exams want you to demonstrate you know the distinction between Naming those two families
@JBZ_Official good question. Once organic molecules get larger, we need to use a number, known as a 'locant', to indicate where the functional group or branch is positioned. In the case of propan-1-ol we are saying that the -OH functional group is on carbon number 1, i.e., an end carbon. This is necessary because the -OH group could be on the middle carbon, and then we would have propan-2-ol
At any rate this video was immensely useful, the best on this topic. So kudos to you for making this video and for replying to everyones comments in such a prompt manner.@@chemistrytutor
Yes, definitely. All A level Chemistry courses are about 95%+ the same content. Mostly the biggest difference is how they group content and how it is assessed
(1) So for alkyl compounds, if the longest possible chain length can go in more than one direction, it doesn't matter which path it takes because for each possibility, the alkyl groups will always be in the same order? It seems that is the pattern, but I don't know if its a rule or not (2) Hypothetically, if there is a compound with one of each alkyl groups, the ordering sequence from first to last would be butyl, decyl, ethyl, heptyl, hexyl, methyl, nonyl, octyl, pentyl, propyl? (3) @28:50 for this example, did you list the halogens in alphabetical order or order of electronegativity? It wasn't clear (4) Is it correct to say that methanone and ethanone don't exist? I could imagine a question asking something about this concept (5) For amines, do we need to number the carbon groups, like for example: 1,3-dimethylamine like in your example, or just leave it as dimethylamine as you did?
Great questions!😁 1) yes, it's a rule. By definition the longest continuous carbon chain is named as the 'main' and the carbon skeleton can twist and branch. Remember these are 2D representations of 3D things. 2) correct 👍 3) alphabetical order 4) yes, correct. With 1 tiny specific exception... phenyl ethanone does exist. A benzene ring replacing the H in an ethanal molecule means the C=O actually has a C on either side so is named as a ketone 5) if each alkyl group is coming from the N then you don't need any numbering
@@chemistrytutor oh yes. quick one - in terms of numbering wouldn't it be 3-hydroxy or do you give priority to alcohol group since aldehyde group is always at the end anyway? thanks
A good rule of thumb is that it has to do with if the functional group has a double (or even a triple bond) So alkene>alcohol for example The good news is that they won't over complicate things and have 2 groups that both contain double bonds
There doesn't need to be a space. I think I added one at times to show the breakdown of the name I dont think you'd be penalised for a gap provided it's not too large
That's a great point! Sadly, the answer is less insightful...there are exceptions to this rule. In the case of "aminoethanal", the "o" from "amino" and the "e" from "ethanal" are retained. This is because "amino-" is not just a prefix; it is considered a part of the name that indicates the presence of an amino group, which is a functional group. The "ethanal" part of the name indicates the aldehyde group attached to an ethane backbone. When combined, the name "aminoethanal" clearly indicates the presence of both functional groups in the compound. The IUPAC rules are complex and have evolved over time to accommodate a vast number of organic compounds, leading to some specific cases where the usual rules might not apply or are modified to better suit the naming of certain compounds. The overarching goal is to ensure that each compound's name is descriptive and unambiguous within the context of organic chemistry.
So, Naming the F before the I group in sequence is just to keep the branches in alphabetical order. Then numbering them try to keep the numbers as small as possible
It's a rule of naming that you can't connect two name parts and have to vowels next to each other. -al and -one name endings would end up as ethaneal which is not allowed. So we drop the e and it becomes ethanal. Same with propanone etc
Actually, the nitrile group, as the highest priority group, sets the numbering. Its end is number 1, which means you number right to left and the methyl group is 2 and iodo is 3 etc
Good question. It's because there isn't a 1-amino ethanoic acid. The acid is top priority so is carbon number 1. There isnt any room on that carbon for the Amine group. This means you could not have the Amine group on carbon 1, and so there is no 1-amino ethanoic acid. So you don't need the 2 for it on this occasion. It's like methyl propane. You don't need to call it 2-methylpropane because the methyl group couldn't be on carbon number 1, because then it would not be propane anymore
Can you explain what you mean, and what you think the numbers should be? If you could use 2 and 3 in more than one way, we give the 2 to the functional group
@Themariamogun that's exactly it. When you have molecules that are more than just carbon chains, there will be a functional group that gives the molecule its reactivity. This could be a double bond, an OH group, etc. Carbon chain branches are given the lowest priority and so usually the highest number. We try to give groups like alcohols and alkenes the smallest possible number, which is why it's butan-2-ol and the methyl group is on carbon number 3
@Themariamogun there are rules for which has the highest priority and therefore which is considered a branch. More often than not it will be reasonably clear. You don't need everything on this list but it might be useful www.masterorganicchemistry.com/2011/02/14/table-of-functional-group-priorities-for-nomenclature/
The smaller number needs to be for the double bond. If you go 3-methyl it ends up being hex-5-ene which is definitely not the smaller number. We prioritise the double bond's number first
@@najimudeenfahima1015 so, I think you mean how we name branched alkanes: 1) find the longest continuous carbon chain and it doesn't matter if it twists or bends 2) see where there are branches and work out a position. The numbers need to be as small as possible so keep that in mind when choosing which end of the chain to number from 3) the name has the branches in alphabetical order ethyl before methyl, methyl before propyl. You don't include numbered words in this order, I.e. ignore di/tri/tetra Hope that makes sense. A question video is out soon about this
You're the hero we need but don't deserve. Thanks a lot, sir!
🙌
❤😊
i really appreciate this - in my 4th week of a level chemistry and this was exactly what i need!! definitely coming back here for my mocks, thank you for your hard work!! :)
That's really lovely feedback thank you. 😊
This video has helped me out immensely, I've been struggling with the IUPAC nomenclature for years, but it's finally making sense! Much love from Nigeria!
Thank you loads for your kind feedback 😊
Thank you so much for this video. I’m actually using this for my BMAT preparation without learning organic chemistry properly in class and I understand a lot better now. And yes a big thank once again. :)
That's really great feedback thank you!
Good luck with your BMAT!
Your a star...Thank you so much.. you filled in the gaps that were missing and it now makes sense to me..amazing 🙂
Thank you so much for your kind words 🙏
I LOVE YOU SO MUCH NO HOMO! I never understood this topic, like never, but after watching ur video I named them all right!
Thank you so much!
That's really brilliant! I'm so pleased this has helped you! Well done for sticking at it 😃
I think there's an error at the end of the video. The first one should be an aldehyde rather than a carboxylic acid given its RCHO formula. Other than that, wonderful video! Thanks for your instruction!
You are absolutely correct, great spot! Identifying errors is such a good learning exercise 🧐
Glad it was useful! 😃
@@chemistrytutor i identified that too!!!
@@gabby-lh4ld well done! Obviously entirely deliberate as a learning 🙄
@@chemistrytutor😂😂😂😂
@@eamanbatool117
😎👌
I’m really grateful boss. I wish unilorin lecturers could teach ladis😭
I'm really pleased it's useful!
This helped me more than any other video has been able to so far and I am so appreciative!
That's really lovely to hear!
Thanks for the feedback 😀
These vids are lifesavers thank you 🙌
I'm not quite sure I understood the part about the consonants. What exactly is a consonant, is it any non vowel character? When does the naming convention of not having two consonants together or two vowels together become relevant?
Yes, a consonant is any non-vowel letter.
It's relevant when you take the first part of a name (that tells you chain length) e.g. ethane and then add a different functional group e.g. nitrile.
Ethanenitrile is correct because e-n is vowel-consonant. The most common error would be to not include the e before the 'n' and you'd end up with consonant consonant
If it was an alcohol functional group it becomes ethanol. We drop the e to prevent it being e-o in other words vowel-vowel.
Again thank you very much.@@chemistrytutor
@@klassischclassicalmusic8472 very welcome 👌
Best video on this topic, thanks a lot!
That's really kind! I'm glad you've found it helpful 😊
I literally can't thank you enough 💗💗
Thank you so much! ❤❤
You're very welcome!
It's lovely to know that it's helpful 😊
thank you so much you r the best
this is wonderful, i love how you put every possible scenario, its good
@gamuchirainmago3328 thank you for your kind words! Glad it's useful 😊
man literally you are the best i look for lots of videos but they were too insufficient or unnecessaryly long thanks for your work
I really appreciate your feedback 😀
i take ib chem he and this has cleared up all my confusion abt nomenclature omg… THANK YOU SO SO MUCH
That's wonderful news! Really pleased to hear that 😀
Absolutely incredible!
Thanks 👍
This has been so helpful thank you so much!
Thank you 😊
It's really nice to know it's useful!
Thanks so much Sir, indeed ur a life saver 🎉🎉
Thanks for the feedback! It's nice knowing it's useful 👍
legit stuff bro, thank you mn
Very welcome! Glad it was useful 👍
You’re a life saver
🫶
Thank you so much for me how to name them because I'm really struggling with the naming in my year 1 A- level because I get confused with the naming as my teacher got further deep into the topic of organic chemistry. And after watching your video, it really help me to clear all the confusion :D
That's great news! This isn't an easy topic, so well done for persevering!
thank you so so much ❤
You're very welcome 😀
THANK YOU so much for the great explanation. I am currently taking Ib chemistry hl , and watching this video has helped me to a great extent. I have a question, How do I figure out which of these functional groups are branches, for example 46:00
Thank you for the feedback 😀 I'm really glad it's useful!
When you have got 2 functional groups the one with the lower priority is considered to be a branch. So alcohol would become hydroxy and amine would be Amino. To decide on priority you generally look for number of bonds. So nitrile with a triple bond is highest, aldehyde and carboxylic acids with double bonds are high. Amine, halogen and alcohol are all low. The one exception I can think of is ethenol which is able to retain both traditional FG name styles
hey i think on 55:01 isnt it 3-hydroxybutanal ? as that is a aldehyde not a carboxylic acid
Yes- it is! Great spot, thank you!!
brilliant thank you 🙏
Thanks for the feedback- I'm really pleased it's useful 😀
Thank you so much sir! could you please cover year 2 Organic :)
You're welcome! Got a few more as videos first but then I'll be on with a2 organic 😃
Thank you so much for helping. I’m preparing for CIE A levels from Bangladesh and found your videos extremely helpful. I really appreciate your hardwork. You are a living legend sir! ❤️❤️❤️
You are most welcome!
It's really lovely to know the videos are helpful 😊
At 55:03 shouldn't the top left be 3-hydroxybutanal since it shows a aldehyde group and not a carboxylic acid?
Absolutely correct! Great spot, and thank you for commenting 😀
GOD BLESS YOU SIR!!! this video was a really big life saver u have no idea how much this helped me understand this topic! im a private a level student and my personal chem tutor was very fast on this topic and i couldnt understand a thing, it was really fustrating me out becuase i thought org chem is gonna be impossible for me to understand before my May exams, but thank God i found ur channel!! this lesson was actually intresting and honestly not that hard as long as i practice doing these everday! :) huge thank u again!
That's really lovely to hear! Well done for keeping going when it's tough!
same mate, I'm a private candidate too! good luck for your exams! 🤞
@@justsomeone5660 thank you :) wish u the very best aswell!
37:36 Sir doesn't an amine need two hydrogens bonded to the nitrogen? Why would this still be classified as an amine when it just has two methyl groups bonded to the nitrogen?
42:24 This confused me a bit, but basically the higher priority group will get the suffix (ending) and the lower priority gets the prefix (starting) ?
Really an amine is a nitrogen connected to a carbon chain with single bonds. That nitrogen could be connected to 1 C (primary amine) or 2C or 3C (secondary or tertiary amines)
For the last example at 47:50, you say we have to make sure vowels are not next to each other in the case of ethenol - but right next to this example you have aminoethanal? And there was also aminoethanoic acid earlier in the video! Why are those vowels not separated?
A very good question. The answer is that the vowels rule is meant as a connection between the carbon length chain prefix and functional group suffix.
For things like chloroethanol the vowels rule doesn't matter either
Ah thanks so much I didn't know how to explain this on my flashcards!
@@itsabbiebear no worries 👍
amazingly useful!
Thank you for the kind words! 😀
54:41 , the top left functional group is aldehyde not a carboxylic acid right? since it doesnt have a COOH but only COH . the answer would be 3-hydroxybutanal ??
You are absolutely correct, great spot! Identifying errors is such a good learning exercise 🧐
28:13 Sir would this be the case when naming the compound too? (That fluoro would always come before iodo when naming because F comes before I in the alphabet?)
From watching the video I'm seeing that when it comes to numbering the compound we always give priority to the functional group of the compound, for eg the OH of an alcohol or the double bond in an alkene but when it comes to naming we start with the alkyl groups (if there is any) and give priority to the alphabetical order of the 1st letter of the alkyl group (but the di. tri doesn't get priority)
Correct on the di-/tri- etc. Essential to include, but no alphabetical influence.
All the branches should be in alphabetical order, butyl- chloro- etc
Functional group carbon is C1
😀
55:40 is it not supposed to be al as the suffix, and its called 3-Hydroxylbutanal? but the lesson was so nice thanks so much
Totally correct, good spot. I think in my notes I'd drawn it out as a carboxylic acid
Dear Teacher, thank you so much for the video. For the example of -amine on 37:47, methylamine means that changing the methane to methyl before the amine. Can I use methanamine that using the rule (48:11) of dropping the vowel letter of prefix before a vowel beginning suffix.
You're very welcome!
Unfortunately, no. You can't do that for amines. You need to use methyl/ethyl etc. There is a family of chemicals that works like that, eg. Propanamide, and so to do that for amines would be too close to that. Exams want you to demonstrate you know the distinction between Naming those two families
30:50 why is it propan-1-ol instead of propanol like methanol previously
@JBZ_Official good question. Once organic molecules get larger, we need to use a number, known as a 'locant', to indicate where the functional group or branch is positioned. In the case of propan-1-ol we are saying that the -OH functional group is on carbon number 1, i.e., an end carbon. This is necessary because the -OH group could be on the middle carbon, and then we would have propan-2-ol
really helpful !! also did u miss out esters ? or is it in some other videos?
I was focusing on the Compounds you'd maybe be asked to name in year 1 of a level. Esters will be in year 2 carboxylic Acids and derivatives topic
For CIE at least esters are a year 1 topic. @@chemistrytutor
Ah, thats good to know, thank you 😊@klassischclassicalmusic8472
At any rate this video was immensely useful, the best on this topic. So kudos to you for making this video and for replying to everyones comments in such a prompt manner.@@chemistrytutor
@@klassischclassicalmusic8472 thanks for your kind feedback! I'm really pleased people find the videos useful! 😀
hi sir at the end........isn't it meant to be 3-chlorobutanone.......because it's butanone you can't really place it in the third listing
am I wroing?
You make a good point. The convention is to have the 2 as well. Sometimes 3-chloro-2-butanone as well
Can this also apply to ocr chemistry?? Sir plz make ocr chem videoas as ur channel is really helpful
Yes, definitely. All A level Chemistry courses are about 95%+ the same content. Mostly the biggest difference is how they group content and how it is assessed
(1) So for alkyl compounds, if the longest possible chain length can go in more than one direction, it doesn't matter which path it takes because for each possibility, the alkyl groups will always be in the same order?
It seems that is the pattern, but I don't know if its a rule or not
(2) Hypothetically, if there is a compound with one of each alkyl groups, the ordering sequence from first to last would be butyl, decyl, ethyl, heptyl, hexyl, methyl, nonyl, octyl, pentyl, propyl?
(3) @28:50 for this example, did you list the halogens in alphabetical order or order of electronegativity? It wasn't clear
(4) Is it correct to say that methanone and ethanone don't exist?
I could imagine a question asking something about this concept
(5) For amines, do we need to number the carbon groups, like for example: 1,3-dimethylamine like in your example, or just leave it as dimethylamine as you did?
Great questions!😁
1) yes, it's a rule. By definition the longest continuous carbon chain is named as the 'main' and the carbon skeleton can twist and branch. Remember these are 2D representations of 3D things.
2) correct 👍
3) alphabetical order
4) yes, correct. With 1 tiny specific exception... phenyl ethanone does exist. A benzene ring replacing the H in an ethanal molecule means the C=O actually has a C on either side so is named as a ketone
5) if each alkyl group is coming from the N then you don't need any numbering
thanks so much, soo soooo soooo helpful!!!
That's lovely to know! Thanks for the feedback 😀
Sir have you made a playlist that covers the entire course of As organic chem?
Hi, yes I have. Here you go... ruclips.net/p/PLceIPyRipWC0bShNkMX1z8WhrJsN8yza_&si=iwI5SwUYZW_be3dr
@54:45 you said top left has a carboxylic acid. However COH is an aldehyde so shouldn't it be 4-formylbutan-2-ol ?
That's definitely an error, good spot! 🧐
It should be 2-hydroxybutanal for the IUPAC Naming 😀
Thanks for pointing that out!
@@chemistrytutor oh yes. quick one - in terms of numbering wouldn't it be 3-hydroxy or do you give priority to alcohol group since aldehyde group is always at the end anyway? thanks
how do you know which functional group has a priority?
A good rule of thumb is that it has to do with if the functional group has a double (or even a triple bond)
So alkene>alcohol for example
The good news is that they won't over complicate things and have 2 groups that both contain double bonds
@@chemistrytutor thank you so much
Is there space between methyl and for example ethane?
Similarly, do I write 1,2-dichloro ethane or 1,2-dichloroethane??
There doesn't need to be a space. I think I added one at times to show the breakdown of the name
I dont think you'd be penalised for a gap provided it's not too large
at 48:31 u wrote aminoethanal but i thought two vowels cant be together?
That's a great point! Sadly, the answer is less insightful...there are exceptions to this rule.
In the case of "aminoethanal", the "o" from "amino" and the "e" from "ethanal" are retained. This is because "amino-" is not just a prefix; it is considered a part of the name that indicates the presence of an amino group, which is a functional group. The "ethanal" part of the name indicates the aldehyde group attached to an ethane backbone. When combined, the name "aminoethanal" clearly indicates the presence of both functional groups in the compound.
The IUPAC rules are complex and have evolved over time to accommodate a vast number of organic compounds, leading to some specific cases where the usual rules might not apply or are modified to better suit the naming of certain compounds. The overarching goal is to ensure that each compound's name is descriptive and unambiguous within the context of organic chemistry.
On an exam would i lose marks if i were to write 3-ethylpentane instead of ethylpentane or something else of the sort ?
Probably not, but I can't say 100%. Try not to include unnecessary numbers, but I suspect this one is not critical.
One question what if the compound has a hydroxyl group & a carbonyl group. How do you name it ?
It would obviously depend on positions, but something like 2-hydroxyethanal
Thanks!
@@Ilham-oc2hu 😃
sir, when does the amine become an amide? Thanks!
When the same carbon with the amine group also has a =O attached
An amide is basically a carbonyl carbon with an amine attached
The reason you gave F priority over I was due to their electronegativity on the periodic table?
So, Naming the F before the I group in sequence is just to keep the branches in alphabetical order. Then numbering them try to keep the numbers as small as possible
@@chemistrytutor okay
Thankyou sir
@@G4n3ro 😀
Why do aldehydes and ketones have (-an) instead of the (-ane) when you wrote propan/butan/pentan?
It's a rule of naming that you can't connect two name parts and have to vowels next to each other.
-al and -one name endings would end up as ethaneal which is not allowed. So we drop the e and it becomes ethanal. Same with propanone etc
Thank you :)
@@oliviama957 👍
55:00 isnt it 3-hydroxybutanal
Absolutely correct! Great spot, and thank you for commenting 😀
4-Methylpentan-2-one
😃
❤❤❤❤❤❤❤❤❤
Thanks 😀
Hello urgent reply needed, did you make a video of year 2 nomenclature and isomers?
Hi there, sadly I've not made a video of this yet
I dont understand how to number left to right or right to left((
Sadly it could be either. Don't think of it as left or right. It's whichever gets you the smallest numbers afterwards
At 39:55 i think iodo is meant to have two while methyl gets 3
Actually, the nitrile group, as the highest priority group, sets the numbering. Its end is number 1, which means you number right to left and the methyl group is 2 and iodo is 3 etc
Thanks for clearing the misunderstanding
👍
Sir, where can we download these powerpoints/notes from? is there some kind of folder with all of these notes?
Hi, unfortunately not. I haven't saved this as PowerPoints. It's an interesting idea thanks!
I'll see what file type my flip chart app can export as
At 45:13, I still do not get why it is not 2-amino ethanoic acid?
Could you think of it as since there are 2 Functional Groups, no FG is given priority when numbering?
Good question. It's because there isn't a 1-amino ethanoic acid.
The acid is top priority so is carbon number 1. There isnt any room on that carbon for the Amine group. This means you could not have the Amine group on carbon 1, and so there is no 1-amino ethanoic acid. So you don't need the 2 for it on this occasion.
It's like methyl propane. You don't need to call it 2-methylpropane because the methyl group couldn't be on carbon number 1, because then it would not be propane anymore
You made a mistake at 31.36 you picked the wrong number labelling for the smallest
Can you explain what you mean, and what you think the numbers should be? If you could use 2 and 3 in more than one way, we give the 2 to the functional group
What do you mean by functioning group ? And did you label it in a way where the alcohol had the lowest number instead?
@Themariamogun that's exactly it. When you have molecules that are more than just carbon chains, there will be a functional group that gives the molecule its reactivity. This could be a double bond, an OH group, etc. Carbon chain branches are given the lowest priority and so usually the highest number. We try to give groups like alcohols and alkenes the smallest possible number, which is why it's butan-2-ol and the methyl group is on carbon number 3
@@chemistrytutorbut how did you decide that the alcohol should have the lowest number than the alkyl group? That’s what confused me
@Themariamogun there are rules for which has the highest priority and therefore which is considered a branch. More often than not it will be reasonably clear. You don't need everything on this list but it might be useful www.masterorganicchemistry.com/2011/02/14/table-of-functional-group-priorities-for-nomenclature/
Pleassse someone help me out, @16:08 can the answer also be 3-methylhexene? Cos I picked the smaller number
The smaller number needs to be for the double bond. If you go 3-methyl it ends up being hex-5-ene which is definitely not the smaller number. We prioritise the double bond's number first
@@chemistrytutor oooh I get it now, thank you
@@Nick-mq6iq no worries! Keep enjoying Chemistry 😀
@@chemistrytutor will do!
A person should really pay attention to alphabetical order here.
🙂
What does it mean?
Hello sir... can u explain please from 10:48 to till
Hi there! I'm not quite sure which part you mean as a finish point?
24:09
@@najimudeenfahima1015 so, I think you mean how we name branched alkanes:
1) find the longest continuous carbon chain and it doesn't matter if it twists or bends
2) see where there are branches and work out a position. The numbers need to be as small as possible so keep that in mind when choosing which end of the chain to number from
3) the name has the branches in alphabetical order ethyl before methyl, methyl before propyl. You don't include numbered words in this order, I.e. ignore di/tri/tetra
Hope that makes sense. A question video is out soon about this
31:56
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