JEE Chemistry Club

J_B892

04:35

How do I go about this?

J_B892

05:36

Is it to do with aromaticity?

AbhigyanC

07:06

@EshaManideep Are you a KVPY SA scholar?

@EshaManideep Wait.. Which grade are you in?

Cuz in SX, there's only 70 questions to attempt if you're only taking part one PCM + part 2 PC or PM or CM

sorry 80... my bad

Either way, you're next level amazing...

J_B892

In 24th one shouldn't all of them show racemisation?

27th....In my opinion it should be D

Esha Manideep

07:43

@AbhigyanC Yeah, I am a SA scholar

AbhigyanC

@Esha Mind sharing your rank?

I'd totally understand if you don't want to

Aaand... There's so much I want to talk to a KVPY scholar about... If you have the time, do let me know :)

@J_B892 Racemisation is a special case of both chiral forms existing. It is the case when the two forms (l and d) are exactly able to cancel out each other's optical rotation exactly... However, there's a catch in SN1 reactions: There's a slight preference given to the inverted form rather than the retained form, due to the ability of the nucleophile to attack the substrate easily from behind. If the carbocation formed is extremely stable (as in option C), only then perfect racemisation occurs

@J_B892 You're most probably right, GRB has a lot of mistakes :/

J_B892

07:58

@AbhigyanC Oh yeah...cyclopropyl methane carbocation is one of the most stable carbocations due to dancing resonance effect right?

Esha Manideep

08:29

@AbhigyanC 491

Abcd

08:47

3

A: What is the reason for the exceptional stability of the cyclopropylmethyl carbocation?

Cyclopropane is a highly strained molecule with bond angle of $60^\circ$. The normal tetrahedral bond angle is $\pu{109^\circ{28}'}$, so we'd expect a ring strain of $49.28^\circ$! For a cyclopropane C atom, the four hybrid orbitals are not equivalent. The two orbitals directed to the outside bo...

Nitrophenols and para-substituted phenols do not give Libermann nitroso test.

@Jasmine what is M

@Jasmine please upload full pic of author's solution so that we can see are the answers coming out to be really different or not?

Abcd

09:24

@AvnishKabaj @AbhigyanC @Ice @Jasmine ^^^

Esha Manideep

09:53

^^is the answer (B) ?

Abcd

10:54

@EshaManideep The person whom you are replying to doesn't get the message unless you ping them using @user

@EshaManideep wrong

0

Q: Aldol condensation in acidic medium

Attempt: I did aldol condensation in acidic medium followed by $\ce{E1cB}$ to get 1,3-diphenylbut-2-enone but the answer given is: I am unable to devise a mechanism to reach the above product from the reactant. Could someone please suggest the mechanism?

Esha Manideep

11:16

@Abcd The answer is ?

@Abcd look at the answer I gave in SE, does it sound fine ?

@Abcd where is the question from ?

Abcd

11:51

@EshaManideep its from fiitjee All India Open test series on mypat

@EshaManideep C

Esha Manideep

How the hell ?

Avnish Kabaj

Now I know the answer I can come up with a mechanism

Esha Manideep

Please give the mechanism

Ice Inkberry

@AvnishKabaj Exactly!

Avnish Kabaj

Still thinking

I'll have to revise orgo

Like by the next day

Ice Inkberry

12:04

Cannot do it. Nice question though.

Esha Manideep

I feel like there is a purpose of focusing on NH4 "aqeous". Probably the molecule undergoes dehydration and then addition.

But how the hell does another methyl group come up from nowhere ?!

Avnish Kabaj

Nh4 aq is for an acidic medium

Esha Manideep

Ofcourse, for hydrolysis of the OH group on benzene ring, and the other groups.

Ice Inkberry

@EshaManideep Haha, I was thinking the same. It would be like having the same reagents twice.

Esha Manideep

I strongly feel that there is something wrong with the key :P

Avnish Kabaj

12:19

Tada

I have a mechanism

Maybe it's feasible

Maybe it's not

I think it is

Sort pf

The phenyl group prolly stabilizes the carbanion

I couldn't come up with anything better

Esha Manideep

Wait, how did you get rid of the oxygen there ?

Avnish Kabaj

12:39

E1cb

Esha Manideep

You mean to say the oxygen went as o2- ?

Avnish Kabaj

Nah prolly reacted with water or something

Esha Manideep

You gave the test too ?

Avnish Kabaj

13:00

Nope

Haven't even completed one revision

Esha Manideep

Anybody of you people giving NSEC ?

Avnish Kabaj

Me

Jasmine

13:22

@Abcd M=MOLARITY

@Abcd I understand we cannot find Cl % by just substracting C %and H % from 100 as the compound is not pure

Ice Inkberry

13:51

@AvnishKabaj I am not sure if the oxygen part is correct.

Esha Manideep

Yeah, did you people give kvpy yesterday ?

Ice Inkberry

@EshaManideep I'm also giving NSEC with NSEP and NSEA. Which ones are you giving?

Esha Manideep

All three :P

Ice Inkberry

@EshaManideep I did, with no expectations xD

Esha Manideep

Did you do that acidity of boron compounds ?

What is the answer ?

Ice Inkberry

13:53

Nitrogen oxygen fluorine chlorine?

It was basicity, right? I have forgotten already.

Esha Manideep

Yeah, that's what I put but now, I suspect it as the lone pair in nitrogen wont be parallel to p orbital of boron, while of oxygen is much close to parallel but in fluorine, it is very well in parallel

Ice Inkberry

@EshaManideep I do not see how the geometry makes the difference.

It depends on the exact question asked.

Esha Manideep

Oh really, doesn't, for involvement in resonance, all of them should be in the same plane right ?

I am not sure of my argument though :P

Ice Inkberry

KVPY questions are deceptive.

Esha Manideep

Extremely, that's a nice excuse for me to give the test this year again !

Ice Inkberry

13:58

And we do accidents in them. How much are you expecting?

Esha Manideep

Probably more.

A 70-75.

Ice Inkberry

Marks? Or correct questions?

Or rank :P

Esha Manideep

Marks.

I see no point in expecting after we give the test anyways, it either boosts my pride or depresses me.

Ice Inkberry

(After the second stage of course)

@EshaManideep Hmm, exactly but it's fun asking people!

Esha Manideep

Yep

You are on Aops too ? "IceBerry"?

Ice Inkberry

14:01

I solved for 87 marks. I am also expecting around the same!

Yes, you too?

Esha Manideep

Yep, I solved for 95 marks, I have already found out that I made 3(2) in part II Physics

Ice Inkberry

I could solve biology questions :(

Maths was comparatively difficult.

Esha Manideep

WHAT ?!

U gave bio ?

Ice Inkberry

I mean, I could solve almost all the questions which I saw of biology. I was just shuffling through sections after completion of my paper. It is well known that PCB is profitable than PCM in KVPY. I wrote maths :P

I am a PCM student.

Esha Manideep

U could finish the paper before given time ?

Ice Inkberry

14:06

Who are you on AoPS?

Esha Manideep

LiFeS_lOvE

Ice Inkberry

@EshaManideep Yes, because I haven't yet completed my syllabus so I left those questione.

Esha Manideep

Ohh, electrochemistry ?

Ice Inkberry

@EshaManideep Ohhhh, I see. Very active on the KVPY thread!

Esha Manideep

Wave Optics ?

:P

Ice Inkberry

14:07

@EshaManideep Some in chem and some on maths(because I hadn't revised the formulae :P)

Coordinate especially.

I did see your profile, you were active a month ago and just now during KVPY xD

Esha Manideep

Poor Guy, when ever an exam containing maths comes up, (JEE Oriented not Olympiad) all that comes into my head is formulae for Co-ordinate geo.

But though, the questions were solvable within 30 sec. without formulae, that disappointed me :(

Ice Inkberry

I am a girl xD

Esha Manideep

Sorry !

Ice Inkberry

@EshaManideep Oh, then I am just very dumb in co-ordinate :P

Esha Manideep

Probably you couldn't see them in panic.

Ice Inkberry

14:11

I didn't solve determinants and some functions too. I always confuse with surjective and injective.

Oh, maybe. It is a relief that you have to do only 2 subjects in part 2.

Esha Manideep

Even me, I asked my neighbor at the cost of giving him the answer to that question :P

Ice Inkberry

@EshaManideep Haha xD My neighbour was a biology student who probably thought I was copying her answers o_O

Avnish Kabaj

Just reviewed divyanka

Just revise divyanka

Esha Manideep

My neighbor slept just after 10 min the exam started, he woke up in the last 20 min, when I woke him up for that injective business. He laughed at me !

Ice Inkberry

Funny neighbours you had got. The day before, I dreamed that I got 20 marks.

@AvnishKabaj What does that mean?

I should revise, I should study?

Avnish Kabaj

14:16

Your dot questions

It helps a lot

Esha Manideep

Bye people, gotta go !

Ice Inkberry

@AvnishKabaj What. Are. You. Saying. Avnish.

Avnish Kabaj

173ß589ñß 2h8çh 697 2343ñ'5 àbl3 59 93 b3f943 94 g95 249ñg

Ice Inkberry