Hey everyone! There’s been a mistake in question number 38. Nucleophilic addition increases the number of carbon atoms. So if we add CN to propan-1-ol we will get 2-hydroxybutanenitrile. The answer should be C, not A. Sorry for this mistake! It would have been A if the final compound produced was 2-hydroxypentanenitrile. However, in this question the correct answer is C (propan-1-ol). Drop a like and subscribe to the channel to support the content! 💪 Fill this form up for Question Paper Requests! forms.gle/bJC4XoRC7AVT6UZHA
it was so helpful I also love the point that you give some extra points with the question itself even if it was not mentioned in the question and you dont just copy what the marking scheme says i really appreciate the good work , Big Love
Question 38 there is a slight mistake. The answer should be C) propan-1-ol instead of A) butan-1-ol because one of the Carbon atoms has been added after the nucleophilic addition with cyanide ion, but originally compound Y had three carbon atoms. Very helpful video the way you explain is easily understandable and nice. Great content!
Thank you so much. The Chemistry Exam is in just a few hours.. a short sleep away.. Thank you so much for your efforts in making these videos. Stay Blessed.
For questions such as 35, would you recommend to just do trial and error since it's easier to do than the math. Do the exams purposefully want us to do trial and error with tricky ratio questions like in Q35?
My thought process for Q20 was that the reactions were given the same conditions hence same temperature. Therefore I looked for an element that would easily decompose which was Ca carbonate and nitrate as barium would need much higher temperature. and then out of those two i went for nitrate cuz it would give more gases.
Hey! Your thought process is alright. Since for 1 mole of carbonate we are getting 1 mole of gas (1co2) But for 1 mole of nitrate we are getting 2.5 moles of gas (2no2 + 0.5 o2) So it has to be a nitrate right, can’t be a carbonate. Now about which nitrate to choose, since you’re given same conditions and you have to assume that thermal decomposition does take place, you need to pick the nitrate which has lower mr, since the same mass is given. Moles = mass / mr, ca has a lower mr than br, so moles is greater!
It might be a silly question to ask 😅 but in Q.3 how did u determine that number of mols for CH2O2 (option D) will be 0.09 same as CO2 as they both have 1 carbon atom ?
I have my AS paper 1 exam tomorrow and thank you so much for this!!! this is really helping me a lot. By the way, you have said in the beginning of the video that I have to get around 34 to 35 to get an A*, and is that same for AS too? I am taking paper 1,2,3 this year and p4 and 5 next year. Do I have to get 34 to 35 to get an A*?
Best of luck for tomorrow! The mark for A* actually varies from paper to paper to be honest. It depends on the difficulty. For example, for this paper, since A was at 27, A* would probably be around 32-33. So i can’t really say for sure what mark you need to get in your paper, since it will depend on the performance of the students taking the exam. But it’s safe to say that you can secure an A* if you get at least 34, if not more!
in 24, decomposition of G2 Nitrates (for example Mg(no3)2 ) produces MgO, NO2 and O2. MgO is a basic oxide but it doesnt react with SO3 directly. It needs to be in aqueous form to react with SO3 like Mg(OH)2. the hydroxide state. So Option C is the best answer (NH3).
Sir I want to add in Q20 cant we do it like this as same conditions used cano3 will decompose more than bano3 at same temp and more gas will be formed. Is this right?
Hey! Yes, you’re right. Nucleophilic addition increases the number of carbon atoms. So if we add CN to propan-1-ol we will get 2-hydroxybutanenitrile. The answer should be C, not A. Thanks for pointing this out. I just realised my mistake. Sorry for this! I’ll correct the mistake immediately and pin a comment. Sorry and thanks again!
Welcome! Sure, here you go! A2 Organic Chemistry In 40 Minutes ruclips.net/video/S75xYUO4CJg/видео.html It’s in this video. The timestamp is 28 mins 35 seconds.
Hey! Sorry about my handwriting :( I'm going to be a doctor soon so I'm practicing bad handwriting already xD Anyway, for question 8, you have to draw the hess cycle properly. For combustion reactions the arrows will always point downwards. You have two routes for this hess cycle. To balance this equation, 1 mol of glucose (a) will undergo combustion to form co2 and h2o. Or 2 moles of ethanol (2 x b) will undergo combustion to form co2 and h2o. According to the hess cycle, the two routes are Direct combustion from Glucose to co2 and h2o (a) Or Formation of ethanol from glucose (Del H) followed by combustion of 2 moles of ethanol (2xb) So the equation is like this, a = Del H + 2b or Del H = a - 2b, Option D. Hopefully it makes sense now!
Hey! Im providing clarification. HCl is actually a colourless gas. It’s kind of like steam (h2o (g)) it doesn’t really have a colour. We say that steamy fumes are formed when hcl evolves. But its actually a colorless gas
Hey! In ques 40 they mention that the compound has an O-H group. If you have an OH, COOH or NH Group, the compound will have a broad peak at around a wavenumber of 3000. This broad peak is due to hydrogen bonding! It absorbs radiations over a range of frequencies
Hey! I'm providing clarification about this. I was also confused back when I was a student. We know that distillation is required to collect the aldehyde from the primary alcohol right? But that's immediate distillation ( within 5 mins). In the question it's mentioned that its under reflux for 1hr. That's enough time for complete oxidation. So, we actually get the Carboxylic acid. They gave that to trick candidates. Hopefully you get it now!
Thank u so much for ur vids, as u told u have reviewed as organic chemistry, I couldnt find that link would be pleasure if u share with that. Ive exam tomorrow and have much issue in organic. and any tip?
Hey! Here you go ruclips.net/video/QRxu0hMcMOs/видео.html Tips, just stay confident and keep track of the time. Try to finish the exam within 1hr and use the last 15 mins for checking and filling up any mcqs you might've skipped. Practice qp from 2020-2022. That's all! good luck
Sir how much do you think we would need to score in p1? if it follows a normal grade treshold? to get an 80% + (if we consider 45/60 for chem p2 and like 58/60 for phy p2) Or is it hard to determine?
You'll need approximately 27-30 in Chemistry P1 to get 80% + and around 24-25 in Physics P1 to get 80% up, if you're sure about getting 58/60 in p2 for 90% you need around 35/40 in each p1
@@CAIEPapersSolved Oh thank you so much, that kind of calmed me down because I have been pissed at myself for doing some silly mistakes in chem p2 even tho I knew the answers in my head. Right now I get around 30/40 and around 32/40 in chem p1 and physics p1 respectively when practicing past papers. So getting that 80% seems possible now. Though obviously my goal is 90%+ which hopefully I can achieve with enough practice
Have you solved feb/march 2022 papers for bio and physics too? Also btw your videos are incredibly helpful, thank you so much for the elaborated explanations!
Yes I have! Here's Physics fm 2022 ruclips.net/video/gUDaXzWNkcA/видео.html Here's Biology fm 2022 ruclips.net/video/r36kZzUfhmE/видео.html You can check out the playlists in my channel for other solved past papers
Yes! You’re right. Im extremely sorry for this mistake. I’ve pinned a comment clarifying my mistake and i’ve also mentioned it in the description of the video. Thankyou and sorry again!
Hey everyone! There’s been a mistake in question number 38. Nucleophilic addition increases the number of carbon atoms. So if we add CN to propan-1-ol we will get 2-hydroxybutanenitrile. The answer should be C, not A. Sorry for this mistake! It would have been A if the final compound produced was 2-hydroxypentanenitrile. However, in this question the correct answer is C (propan-1-ol).
Drop a like and subscribe to the channel to support the content! 💪
Fill this form up for Question Paper Requests!
forms.gle/bJC4XoRC7AVT6UZHA
Hello, are you a teacher??
@@damodarramdoyal5890 even if he wasn't he still has the knowledge of a professor
@@saifahmad2419 I'm not blaming him for not being a teacher bruh. Ok, thanks for your information.
Ampun puh
it was so helpful I also love the point that you give some extra points with the question itself even if it was not mentioned in the question and you dont just copy what the marking scheme says i really appreciate the good work , Big Love
Thankyou for your kind words and i’m Glad it was helpful! Keep on supporting the channel ❤️
Question 38 there is a slight mistake. The answer should be C) propan-1-ol instead of A) butan-1-ol because one of the Carbon atoms has been added after the nucleophilic addition with cyanide ion, but originally compound Y had three carbon atoms. Very helpful video the way you explain is easily understandable and nice. Great content!
I have As chemistry p1 tomorrow. Thank you for your amazing videos. Helped me tons
Good luck! 🤞
same
same here brother
@@anushiti2012 good luck man
@@divyanshtiwari1592 good hehe
Tomorrow's my Mock, these videos have been the most useful resources to me for the entire day! I can't thank you enough sir!
Thank you so much. The Chemistry Exam is in just a few hours.. a short sleep away.. Thank you so much for your efforts in making these videos. Stay Blessed.
You’re welcome! Good luck ❤️
56:56 Man really just quoted Thanos
At least someone picked it up :’)
A small price to pay for salvation
@@CAIEPapersSolved
For questions such as 35, would you recommend to just do trial and error since it's easier to do than the math. Do the exams purposefully want us to do trial and error with tricky ratio questions like in Q35?
My thought process for Q20 was that the reactions were given the same conditions hence same temperature. Therefore I looked for an element that would easily decompose which was Ca carbonate and nitrate as barium would need much higher temperature. and then out of those two i went for nitrate cuz it would give more gases.
Hey! Your thought process is alright.
Since for 1 mole of carbonate we are getting 1 mole of gas (1co2)
But for 1 mole of nitrate we are getting 2.5 moles of gas (2no2 + 0.5 o2)
So it has to be a nitrate right, can’t be a carbonate.
Now about which nitrate to choose, since you’re given same conditions and you have to assume that thermal decomposition does take place, you need to pick the nitrate which has lower mr, since the same mass is given. Moles = mass / mr, ca has a lower mr than br, so moles is greater!
It might be a silly question to ask 😅 but in Q.3 how did u determine that number of mols for CH2O2 (option D) will be 0.09 same as CO2 as they both have 1 carbon atom ?
I have my AS paper 1 exam tomorrow and thank you so much for this!!! this is really helping me a lot. By the way, you have said in the beginning of the video that I have to get around 34 to 35 to get an A*, and is that same for AS too? I am taking paper 1,2,3 this year and p4 and 5 next year. Do I have to get 34 to 35 to get an A*?
Best of luck for tomorrow!
The mark for A* actually varies from paper to paper to be honest. It depends on the difficulty. For example, for this paper, since A was at 27, A* would probably be around 32-33. So i can’t really say for sure what mark you need to get in your paper, since it will depend on the performance of the students taking the exam. But it’s safe to say that you can secure an A* if you get at least 34, if not more!
for q38, won’t it be C and Not A cuz nitrile group is being added, so an extra carbon atom is added
this is like my favourite channel now. thank u SM! finals saviour
Welcome to the church 🙏
21:10 in this question, why don't the number of hydrogens balance out?
hello sir doesnt an aldehyde also decolourises bromine water so wouldnt 27 b be correct?
please add time stamps to ur videos and thank u, helped a lot
Alright!
Sir in Q-13 C2H5 is gaining Hydrogen to convert to C2H6, so isn't it reduction?
If proton was gained, shouldn't it be C2H6+ ??
the electrons used in bonding with Zn are now used to bond with hydrogen, there is no additional charge
I have my exam tomorrow morning, I absolutely love your videos thanks a lot.
Hey! Glad I could help :) best of luck you’re gonna rock it
THANK U VERY MUCH FOR THIS AMAZING EXPLANATION, I'll be in the exam in a couple of hours, life saver
❤️
Thank you so much for these videos
They are really helpful 👏
You're very welcome!
i subbed because theres a link for this paper that is really hard to get and u have to login which is just time consuming! Thank u monsuir!
Thanks for subbing!
@@CAIEPapersSolved deserved
wow I am really l looking forward to seeing the level grade🎉🎉🎉 Hope you can list it next time as well
Hey! I didn’t get what you meant actually. Could you repeat what you want me to list? The marks required for specific grades?
in 24th can u explain why option D is incorrect. they produce basic oxides aswell
in 24, decomposition of G2 Nitrates (for example Mg(no3)2 ) produces MgO, NO2 and O2. MgO is a basic oxide but it doesnt react with SO3 directly. It needs to be in aqueous form to react with SO3 like Mg(OH)2. the hydroxide state. So Option C is the best answer (NH3).
@@CAIEPapersSolved thank youuu❤️❤️
Sir I want to add in Q20 cant we do it like this as same conditions used cano3 will decompose more than bano3 at same temp and more gas will be formed. Is this right?
Yes!
I have an exam in about two hours. Thank you so much for this!!
Btw 38 is C not A, please keep ms open while solving you will miss guide a lot of people
53:58 sir there is a mistake in number 38 i think? as in the ms it is showing ans is C propan-1-ol but u gave a
Its C for 38 because when you add CN one carbon is added so it has to be propan 1 ol
Hey! Yes, you’re right. Nucleophilic addition increases the number of carbon atoms. So if we add CN to propan-1-ol we will get 2-hydroxybutanenitrile. The answer should be C, not A. Thanks for pointing this out. I just realised my mistake. Sorry for this! I’ll correct the mistake immediately and pin a comment. Sorry and thanks again!
Thank you so much the videos are very helpful. May I please have the link to the bonus chapter video on A2 organic chem?
Welcome! Sure, here you go!
A2 Organic Chemistry In 40 Minutes
ruclips.net/video/S75xYUO4CJg/видео.html
It’s in this video. The timestamp is 28 mins 35 seconds.
Thank you
Sir for IR spectrometry do we have to memorize what has broad/sharp peaks?
This is the trick, HYDROGEN BONDING results in broad peaks. The others will be sharp!
exam tomorrow...thank you for this video! it was quite helpful
Good luck!
thank u DADDDYYYYYY!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
😳
YOU'RE DONE!!! LMAO
The fu-💀
Can you please explain why answer is D in question 8 as the handwriting was a bit blur to understand 😩
Hey! Sorry about my handwriting :( I'm going to be a doctor soon so I'm practicing bad handwriting already xD
Anyway, for question 8, you have to draw the hess cycle properly. For combustion reactions the arrows will always point downwards. You have two routes for this hess cycle. To balance this equation, 1 mol of glucose (a) will undergo combustion to form co2 and h2o. Or 2 moles of ethanol (2 x b) will undergo combustion to form co2 and h2o. According to the hess cycle, the two routes are
Direct combustion from Glucose to co2 and h2o (a)
Or Formation of ethanol from glucose (Del H) followed by combustion of 2 moles of ethanol (2xb)
So the equation is like this, a = Del H + 2b
or Del H = a - 2b, Option D. Hopefully it makes sense now!
@@CAIEPapersSolved thank youuuuuuu🥺❤️
Sir in qus 22
Isn't the gas white fumes of HCl?
Hey! Im providing clarification. HCl is actually a colourless gas. It’s kind of like steam (h2o (g)) it doesn’t really have a colour. We say that steamy fumes are formed when hcl evolves. But its actually a colorless gas
In q40, how do we know that there must be a broad peak?
Hey! In ques 40 they mention that the compound has an O-H group. If you have an OH, COOH or NH Group, the compound will have a broad peak at around a wavenumber of 3000. This broad peak is due to hydrogen bonding! It absorbs radiations over a range of frequencies
@@CAIEPapersSolved ok thank u so much
29 marks in this paper how are they for a?
Thanks a lot for this helpful video!
i was so confused in 3 and 26, Thanks a lot for explaining them so damn well
You’re welcome! Good luck 🤞
amazing, just wanted to ask that in mcq 31 they've written "product is collected by distillation" , so shouldn't we use an aldehyde. I'm so confused 🤧
Hey! I'm providing clarification about this. I was also confused back when I was a student. We know that distillation is required to collect the aldehyde from the primary alcohol right? But that's immediate distillation ( within 5 mins). In the question it's mentioned that its under reflux for 1hr. That's enough time for complete oxidation. So, we actually get the Carboxylic acid. They gave that to trick candidates. Hopefully you get it now!
@@CAIEPapersSolved yesssss now i gett itt., thankkuuu !!
amazing and helpful channel, gained a subscriber!
Welcome aboard! Thankyou! :)
Thank u so much for ur vids, as u told u have reviewed as organic chemistry, I couldnt find that link would be pleasure if u share with that. Ive exam tomorrow and have much issue in organic. and any tip?
Hey! Here you go ruclips.net/video/QRxu0hMcMOs/видео.html
Tips, just stay confident and keep track of the time. Try to finish the exam within 1hr and use the last 15 mins for checking and filling up any mcqs you might've skipped. Practice qp from 2020-2022. That's all! good luck
@@CAIEPapersSolved Thank u so much Sir, u r a legend. Keep up the content :)
@@zredge823 Good luck for tomorrow! ❤
@@CAIEPapersSolved means alot :)
Sir how much do you think we would need to score in p1? if it follows a normal grade treshold? to get an 80% +
(if we consider 45/60 for chem p2 and like 58/60 for phy p2) Or is it hard to determine?
Are you talking about the May June 2022 series?
@@CAIEPapersSolved Yeah the may june series
You'll need approximately 27-30 in Chemistry P1 to get 80% +
and around 24-25 in Physics P1 to get 80% up, if you're sure about getting 58/60 in p2
for 90% you need around 35/40 in each p1
@@CAIEPapersSolved Oh thank you so much, that kind of calmed me down because I have been pissed at myself for doing some silly mistakes in chem p2 even tho I knew the answers in my head. Right now I get around 30/40 and around 32/40 in chem p1 and physics p1 respectively when practicing past papers. So getting that 80% seems possible now. Though obviously my goal is 90%+ which hopefully I can achieve with enough practice
Have you solved feb/march 2022 papers for bio and physics too? Also btw your videos are incredibly helpful, thank you so much for the elaborated explanations!
Yes I have!
Here's Physics fm 2022 ruclips.net/video/gUDaXzWNkcA/видео.html
Here's Biology fm 2022 ruclips.net/video/r36kZzUfhmE/видео.html
You can check out the playlists in my channel for other solved past papers
@@CAIEPapersSolved thank you!
no.38 answer is C sir.
Yes! You’re right. Im extremely sorry for this mistake. I’ve pinned a comment clarifying my mistake and i’ve also mentioned it in the description of the video. Thankyou and sorry again!
very helpful!!
Oh my god
It's almost at 1k😱😱😱👏👏👏
Yup! Thanks to your immense support ❤️
I remember you man :’) you were my 600th sub. You’ll always have a place in my heart
@@CAIEPapersSolved Thanks man... I wish you all the best!!
Your 38th answer is wrong, the answer is C
A well deserved subscribe❤
❤️
happy to be the 600th sub
Thanks for supporting the channel! ❤️
thanks a lott
thank youu
jus sking r u indian?
Bangladeshi
@@CAIEPapersSolved respect fam!
56:57 😂😭
What did it cost? *inserts gif*
batch of 2023 here