(19th of 19 Chapters) Organic Chemistry part 2 of 3 - GCE O Level Chemistry Lecture

[@adammustafa6423]

Thank you very much Teacher !! May our our prayers for you and Allah's Blessing be with you for ever!!! THANK YOU!

[@ChemLectures]

glad you found them useful!

[@ChemLectures]

Note that the equation in checkpoint 5 should have a 2 in front of CH3COOH. the explanation slide which follows at 34:40 is correct.

[@rashidtarar6210]

Teaching is the proffesion which teaches all other professions

[@marwasadaf8760]

Thank you so much sir for making these videos. My chemistry teacher left our school at the start of grade 11 and our syllabus was left incomplete. Your videos have really helped me understand organic chemistry well.

[@nathandanyal4468]

Thanks Chua Tung Kian for chemistry lectures it helped me a lot in preparing for my o'levels

[@ChemLectures]

+Nathan Daniel welcome

[@name-gw2qm]

You are the best,Mr chua.I am from Queensway Secondary.I learned so many concepts quickly by looking at your videos.Hope you were my teacher

[@ChemLectures]

Glad you found them useful. Let your friends know of this resource too.

[@htgadgets4151]

At 8 am is my exam and i am watching this video at 3 am First interaction with organic chemistry

[@panzerking3565]

Is there naming hydrocarbons in syllabus?

[@fatsaj]

You're an awesome teacher :) HONESTLY i used to freak out at the thought of organic chemistry ... u made it a piece of chocolate cake .. HOPE IT PAYS OFF :)

[@ChemLectures]

Glad it helped. Let me know how your assessments turn out.

[@fatsaj]

Chem Lectures ohhh u actuallllyyyy replied! Yep the exam was good but i should've given organic chem more time...not easy to pull off in just 2 days :P But ur videos are always there to help :)

[@ChemLectures]

was on a break for the past couple weeks. yes, you definitely need more time to master the subject, so continue to work hard.

[@fatsaj]

Chem Lectures thanksss

[@besherlegends1202]

can you make a video of you solving organic chemistry pastpapers questions please.

[@adritarahman5731]

sir could plz explain how to balance the equation in q2 checkpoint 5? why is there an extra hydrogen in the product how do i balance it correctly??

[@jielin5308]

Thankyou so much it made my revision so much easier !! And tmr is olevels chemistry!!

[@ChemLectures]

great

[@AbduleeFtw]

Hello teacher why in magnesium ethanoate formula is CH3COO first shouldnt be positive ion first in formula ?

[@ChemLectures]

its just the way it is written. You could write HOOCCH3 as well, but that would be atypical

[@gladysg3525]

hi i dont understand why the answer for checkpoint 2 question 2 answer is A instead of B - 13;37 . The rest show a decreasing gradient.. so A,C and D shld be wrong... mmm is the answer A or B?

[@ChemLectures]

mp/bp graphs can never be like "option B". when Mr increases (because n increases), the strength of intermolecular forces increases, hence mp/bp increases. however, we do not just look at the gradient, you also need to look at the graph shape. for option B, the graph will go upwards, i.e., towards infinity, which is not possible. so we go with option A. Also, mp/bp will increase quickly until a certain extent, but thereafter increase slowly because the surface area of the molecule which is available for intermolecular forces to act on is reduced due to extra conformational arrangements.

[@gladysg3525]

Chem Lectures Oh right I see I see. That made a lot of sense! Thank you for clarifying :).

[@ChemLectures]

welcome. keep the qns coming

[@kzdwt9969]

3.13 on the left side there are 6 oxygens but on the right there are only 4? Im confused

[@pineapplepie5818]

Thankkkk uu soooo mucchhhh

[@ChemLectures]

welcome

[@kzdwt9969]

11.13 how do u know MnO-4 oxidizes to Mn2+ though? How do u get that

[@rashidtarar6210]

Sir. A good teaching like ut

[@ChemLectures]

Thanks and welcome

[@faizanqaiser4027]

im pretty sure he doesnt read these anymore but this helps alot

[@ChemLectures]

+Faizan Qaiser nope, I do read them once every couple of days :-) so if you have any questions you can pop them here and i'll answer them best as I can

[@faizanqaiser4027]

+Chem Lectures (Chua Tung Kian) oh yaaaay. no questions but i only wanted to say that ur work is awesome

[@ChemLectures]

+Faizan Qaiser thanks!

[@RachelSeah]

Hi ! These videos are really great in helping me prepare for my o's this year.. I've got a question, is it better to use Van Der Waals forces or intermolecular forces. Are they the same?

[@ChemLectures]

Yes, they are the same. you can use both interchangeably for O levels. in A levels, there may be some questions which may require a different touch, for example intramolecular vdw as opposed to intermolecular vdw. But for O levels, you are still safe.

[@RachelSeah]

+Chem Lectures (Chua Tung Kian) thanks ! :)

[@munshiabdussalam9931]

Thank You sir.

[@waniasiddique9346]

Isnt P and R also the ssme at check point 3. Please answer

[@MuhammadUsman-fw2oo]

Very good explanation and way of explaning the chapter...thanks

[@ChemLectures]

thanks. glad it helped

[@waniasiddique9346]

Isnt P and R the same at check point 3..???

[@shayanfaisal8822]

Thanks a lot sir

[@sharjeelzahid3757]

From where can I get your notes

[@ChemLectures]

www.chemlectures.sg

[@glamophobic2409]

hi, wanted to ask that when writing formula of esters can we write CH3CH2COOCH2CH3 as C2H5COOC2H5? if not then why?

[@ChemLectures]

Yes you can. but if they ask for full structural formula you have to write it out as CH3CH2COOCH2CH3

[@everythingyoutube4754]

sir what is the arrow front and back in ester?

[@ChemLectures]

it means reversible. the reaction is reversible. meaning the products can break down to give you back the reactants.

[@manz007]

Sir chem lectures I was meaning to ask you this question for a while ..... I am doing alevels and how much organic chemistry video does that cover of my organics in alevels .....is it 3O% or something.... I need to revise it but are those videos just olevel. How much organic Chemistry is in olevels and alevels --- distributed I mean.... thanks in advance.... sorry to bother you Sir.

[@ChemLectures]

Hmm, O level organic chem is about 10% or less of A level organic chem. There is a lot more content and reactions in A levels.

[@manz007]

Chem Lectures ... oh thanks sir.

[@MTS-eq2fo]

Can we use potasium dichromate is stead of potasium permangante to convert alcohol into acid

[@ChemLectures]

Yes. oxidising agent as well

[@faheemfifax5931]

Sir, First of all your videos are amazing and I am preparing for this year I level from them so wish me luckkk.... And secondly, where can we get these slides which u use in the videos so I can do a quick review when necessary

[@ChemLectures]

the videos follow the notes. the notes will suffice

[@aishashaikh5699]

thankyou soooooooooo muchhhh

[@ChemLectures]

+Aisha Ali welcome

[@khaliifaxoxo942]

Your videos are awesome and it help me alot and thank you soooooo mmuuucchhhh

[@ChemLectures]

+khaliifa xoxo thanks

[@technovenom]

Sir How To Deduce Weather The Compound Is An Alkene, Alkane Or An Alcohol?

[@ChemLectures]

this depends on how the qn is asking you to. maybe you could elaborate?

[@technovenom]

Like how can i deduce what is an alcohol,alkene or an alkane. when the q is based on eq.

[@ChemLectures]

you will need to use the distinguishing rxns. for example, alkenes will decolourise brown aqueous bromine; alcohols can react with Na metal with the evolution of H2 gas; as for alkanes, it is usually the last one to be identified so by elimination, that would be the alkane

[@waniasiddique9346]

Why there are double bonds between carboxlic acid ??? Answer fast please.........

[@ChemLectures]

the COOH has 1 double bond at C=O

[@waniasiddique9346]

Thank you sir

[@jiayi497]

hi, can you explain checkpoint 5 qn2? how do u get CH3H2COONa? thanks. Pls accept my request for the notes too:))

[@ChemLectures]

Its an acid metal reaction. So assuming the acid is HCl, and the metal is Na, you will get NaCl. So now the acid is CH3CH2COOH. The H from COOH is dissociated, giving CH3CH2COO-. And Na reacts with acid to form Na+, so you put them together to get CH3CH2COONa

[@farooqyousaf4657]

Checkpoint 5 equation is not balanced!!! you do it by you own right when you suppose ethanoic acid as X but the equation in your document slideshow whatever is incorrect, in my opinion at there must be 2CH3COOH. Sir please check it Thanks...

[@ChemLectures]

+farooq yousaf hi there. yes, I missed out the 2 in the checkpoint slide but the explanation which follows shows the correct balanced equation

[@farooqyousaf4657]

+Chem Lectures (Chua Tung Kian) Again Sir, Thanks a lot. It is helping me to prepare for CIE Chemistry two days ahead!!!

[@farooqyousaf4657]

+Chem Lectures (Chua Tung Kian) Actually I'm prepared :)

[@AbdulAhad-gm2pd]

Shouldn't the answer too question 2 checkpoint 5 be CH2CH3COONa+H2O? if not please explain it to me why 1 carbon is gone from propanoic acid.

[@ChemLectures]

+Abdulahad Sajjad its a typo error. missed out a C in CH3CH2COONa. The 2nd C from the right is missing.

[@AbdulAhad-gm2pd]

+Chem Lectures (Chua Tung Kian) ok thanks

[@AbdulAhad-gm2pd]

+Chem Lectures (Chua Tung Kian) i gave my chemistry paper and it was great, got better understanding from your videos, im really hoping you make A level chemistry lecture series as well.

[@user-zm5wr2zw2t]

Why is it written as (CH3COO)2Mg and not Mg(CH3COO)2? Or either way is also acceptable?

[@ChemLectures]

More of convention. Both ways are not wrong, but adopt the 1st way. because its like writing a person's name: Tan Ah Kow is convention, Ah Kow Tan, is unconventional in certain areas of the world.

[@intisarillhammasud6038]

5:00

[@kzdwt9969]

17.32 im confused if the formula for carboxylic acids are CnH2n+1COOH then why is methanoic acid CH2O2?

[@ChemLectures]

it's HCOOH. n=1 and the C belongs to COOH.