Naming alkanes with alkyl groups | Organic chemistry | Khan Academy
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- Опубликовано: 11 окт 2024
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Naming linear alkanes with branching starting from the structure, and drawing the structures based on the name. Created by Sal Khan.
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@minoc2 You are right. Shows me that I shouldn't think of the names on the fly. Will make a correction video.
7:52
Should be
4-Methylnonane
As we take the longest chain
We never do that according to the rules❗️
I agree bro. So what's the right answer?
Yep
@@josephmalitig5553 The correct name would be 4-methyl nonane
Yeah . They made a correction video
10:58 That'd be my Chemistry tutor calling to complain about how easy you make it all seem
7:52 I would call this 4-methylnonane.
you sir are correct
So then should you call it 2-propyl heptane or 4-methyl nonane
Daniel Andrew DeMott Watch the next video
how come?
EDIT: nvm I just saw the next video
if we take the longest chain this makes more sense
Why paying for college/university when RUclips is free and better. Lol
College is just for a credential, nothing more. It stands as proof of having learned it at some point. I wish there was RUclips University.
@@ninjanerdstudent6937 May I give you my life, my liege
I literally skip my chemistry class and just watch these videos and end up getting decent scores in my tests and exams.
nah im in 9th grade
You dont get a masters degree from RUclips 😁
LOL my teacher pretty much tried to teach us this in a span of 3 weeks and she made it so damn complicated that I simply didn't know. I watch 4 videos here and it all makes perfectly sense.
***** different teachers I suppose.
Same..
what's that with those teachers😂
I'm thankful that my teacher explained it well
bro after 8 years, what are you doing now currently as i suppose you are graduated
I have a mnemonic device for remembering the first four alkanes: My Ethiopian Professor's Butt. My for Methane, Ethiopian for Ethane, Professor for Propane, and Butt for Butane. Every other alkane that comes after that follows the numeric pattern pentane(5), hexane(6) heptane(7) and etc. Not the most appropriate phrase but hope this helps :)
I use monkeys eat purple bananas
or just learn it as it is it's not that hard
@@khalilicf people learn and remember things differently❤️
@@iam.tryphena ok 🤓
@Mohammed Abid from all the possible mnemonics you chose a professor's butt 😂🙈
But thank you for what you do, the free help is definitely appreciated.
He probably would have kept on going if it wasn't for that phonecall :(
Spoiler Alert!
HAHAHA I was thinking the same thing
lmao my finals in 6 days and khan academy always saves my day
Thank you!!! I have an organic chemistry exam next Friday and this is helping me review and understand a lot more/better.
@brco2003 Each carbon has 4 bonds. If it is already bonded to 2 other carbons then the other 2 will be to hydrogen. If it only has 1 carbon bond, the other 3 will be hydrogen
ive watched so many videos like this and did not understand until this video. THANK YOU
Thank you I have been struggling with this and your video help me a lot will continue to watch and learn
Beautifully taught! You're amazing and the reason I'm passing chemistry and math and life in general!!! Thank you
2-PROPYL WILL MAKE THEE LONGES CHAIN
Now that I see the 2-propyl heptane is incorrect and should be 4-methyl nonane, are you supposed to check the length of the carbon chain even off of an alkyl group? I thought you only determine the length of the carbon chain based off of the amount of carbons BEFORE drawing an alkyl group. So just to reiterate, are you supposed to recheck the length of the carbon chain once you've draw in an alkyl group to make sure that it is in fact the longest chain? If any of this made sense. PLEASE HELP
That's the most interesting most basic iupac nomenclature ever!!!! Love it👌
the different collors really helps
Great demonstration, thanks for making understanding these chains much easier.
OMG explanations that actually make sense!!!
Thanks so much Khan! My lecturer makes this stuff so complex but you explain it so well and clearly!
@khanacademy Not critical at all - I am grateful for the refreshing way to remember my basic chemistry. Thanks again for sharing.
Thanks Sal my chemistry and maths are increasing rapidly all thanks to your great academy!
7:50 the longest chain is diff
WOW after so many yrs i finally understand simple concepts #thank you so much SAL
Best channel to get up things in the easiest way in chemistry
That's actually 4-methyl nonane not 2-propyl heptane. It's the longest chain of carbons you use as your base for the name. Which substituent has less carbons? Methyl or propyl in this case? Methyl.
+Christopher Johnson I noticed this as well, so what would be the proper way to write 2-propyl heptane? or will this just always be referred to as the other?
yeah it just can't exist, it would always be 4-methyl nonane.
+Christopher Johnson he made a correction video
I'm reviewing my first 2yrs of university with your channel and thinking how different my grades in highschool would have been if i had found your channel earlier.
This is so fun.
Sir, I thank you from the very bottom of my heart. Words won't express my gratitude.
Thank you so much for explaining! I could not understand the explanation on my chemistry textbook!! I'm doing a distance learning and videos like this helps alot!!
With the addition of the propyl group to the heptane, the longest carbon chain is no longer 7. If you draw out the entire molecule without numbering the carbons before adding the propyl group and number the carbons afterwards, you'll find that it's nonane with a methyl group attached at the 4th carbon.
This video was so helpful. Thanks Mr. Khan
Thank you so much! I was struggling with trying to figure this out through reading the text and wasn't getting the concept. Your explanation in the video made it all click, I'm so grateful!
I'm binging organic chemistry playlist and this got 0 to a 100 real quick
this surelyy helped me a problem i couldnt solve
7:57 if you make a molecular structure like that, the principal carbon chain becomes 9 and you also said that while naming the molecules, you should the biggest chain into consideration..., so...?
Thank you so much bcz I was watched last time 7 years old ago..... So helpful lecture.... Life struggle
OMG THANK YOU SO MUCH. i just started grade 12 chemistry and like many people my teacher makes these concepts so complicated
Thank you, you help me understand real good.
Perfect for beginners! Awesome work Khan Academy!
This is very helpful
Really helpful!!!! Thank you so much!!!!!
Thx helped a lot!
Wouldn't that be 4-methyl nonane? Because the longest chain has nine carbons?
Yes
You are right
This was great! Thank you!
Correct me if I am wrong, but in regards to 6-butyltetradecane and the idea that 9-butyltetradecane never being an actual name since it would be named the first way ( 6-butyltetradecane)... Could you say that with a chain and one group attached, you would never attach it to a carbon greater than the halfway point, for example the last number to exist would be 7-butyltetradecane in this case. Please let me know if that makes sense?
Wow! great explaining! I like using colors coz it's easy to understand =)
Thanx alot !!
Help? What should be the next video after this? In the order of the video viewing, it jumps to double bonds etc. A video seems to be missing. Help!
Thanks so much sir!
yoo such a great teacher .. i'm from Egypt and this it not my mother language but i just understood every thing ..
thanks :D
Thank you so much!
@khanacademy I just watched "Representing Structures of Organic Molecules" which I should have watched before wasting your time. Thanks!
You're goated!
that phone ring timing was perfect.
no, he probably would've kept on going if the phone didn't ring :(
THANK YOU SO MUCH! 🙌🙌🙌
Thanks for the video, it was really helpful!
Yes, thank you!
I think you might be the reason I pass O chem. Thank you. It's so incomprehensible in class, but easy here!
Well thanks 💛💛💛
THANK YOU SO MUCH.
aw man...i luckily have a decent chem teacher this semester but we are tackling o-chem in the last chapter...i've been frozen since we started going over it and became more and more frightened as I read textbooks and different science sites online. I just remembered about Khan Academy! I'm finally understanding all the notes in front of me! Thanks for saving my butt again!
I think that it would be the same thing as an alkane has sigma bonds which are free to rotate, therefore they can change their shapes into both 4-Methylnonane and 2-propylheptane.
u r awesome. Thanks a lot.
thnks!
2-propyl heptane is named wrong :P should be 4-methyl nonane
Oh I just saw the next video haha!
I was about to comment the same... Good thing that Khan Academy fixes everything they make wrong...
if u go reverse, i can call 2 propyl heptane as 4 methyl nonane, im confused
U r great....
Still useful after 10 years
Awesome explanation!
Yok know you do a better job than my teacher does bc i could understand this lesson here instead of my school even if English is not my native language
Beautiful hand writing
Sir plz make a chapter vise playlist lecture according to Pakistani chemistry book because I have problem to find out lectures according to my book topic .
Thank you❤️
in your 2 propylheptane example: would the propyl group not now be part of the longest chain, so that its now a 9 carbon chain, non, instead of hep?
Sir, you make it look sooooo eassssyyy! Thank you!! :)
I am not sure if 2-propylheptane is the correct name as it is more likely called 4-methylnonane, assuming we are naming by the longest chain.
You are saving me!
bro thank you so much
it was so helpful :)
THANK YOU THANK YOU THANK YOU
God bless you Mr. KHAN thanks for the videos great help :D
Yep, I was sure he was going to cover that, but then he didn't. You understood correctly. (Only it is indeed 4-methylnonane.)
For 2- propylheptane
I don't think it's right
When we add the propyl to the 2 nd carbon the longest chain will no longer contain 7 carbon , it will have 9 there for the name changes to
4-methylnonane
Im a little confused so if anyone could inform me on this that would be great; in the start of the video where he showed the organic molecule "methyl-nonane", should it not be a nonane because it is bending which the angular strain of the bond stops from going beyond a certain angle? I may be wrong so someone please help me out.
does the behavior of a molecule vary by a lot depending on which carbon a group is attached to?
7:55. why not start numerating from the right to the left, when reaching 6 we continue up to the 9th number which makes it the longest chain. so in a way, it wouldn’t be correct...
You rock man!!!!
same question here, Is 4-methylnonane and 2-propylheptane the same?
How would you draw branches that have things like "....6-(4-methylpentyl)dodecane" I can draw the rest of the problem, just slightly confused at the methylpentyl part.
For 2-propylheptane u drew, did the longest chain change? The longest chain became 8. So, actually wouldn't be called 3-methyloctane?
Not 8, the longest carbon chain was 9 (in your 2nd eg. 2propyl heptane) so the carbon compound became the same as his first example (3-Methyl nonane).
When you're given a name of an organic compound and you draw it, surely the name would change because your adding carbons which means the longest carbon chain's length has been increased?
If anyone gets what I'm trying to say, please reply
@minoc2 Shouldn;'t it be 3-methylnonane
brilliant
Finally.
An instructor like my college teacher.
Articulate, intelligent and understandable.
Thank You very much
@khanacademy Ah, I see. Thanks!
@khanacademy can you show that in a video? cause in our textbook it shows the carbons with different numbers of hydrogens on it and we have to draw a chain like that from a given name
So the 2-propylheptane would be more accurately called 4-methylnonane. Is that correct? And further to that, if you have an alkyl group with more carbons than the number prefix before it then it is actually not the best name for it?
When talking about alkanes that is...