The Periodic Table

Gaurang Tandon

05:26

@AvnishKabaj you there?

wanna check out 2-3 MS Chouhan; Advanced Problems In Organic Chemistry; questions?

i think they're wrong

Avnish Kabaj

@GaurangTandon sure

If I've done them

Gaurang Tandon

see q11 in alkyl halides (chapter 5C)

two methods are described to prepare a fused three ring carboxylic acid

using grignard and NaCN

see if it's there in your edition

Avnish Kabaj

@GaurangTandon Haven't done alkyl halide (not in 11th course)

But I think the answer is correct

Gaurang Tandon

@AvnishKabaj you might have read it in clayden?

Avnish Kabaj

CN-

Will tend to do e2

Elimination

Hard base

Gaurang Tandon

05:35

dude it's doing S<sub>N</sub>2 here

??

Avnish Kabaj

That's with alkane

The compound below is like very steric

Another thing we were taught was that e2 is preferred over substitution because the entropy of the intermediate is more

Gaurang Tandon

dude you're looknng at the wrong question I guess

is the answer "(c) method 1 will work well, but method 2 is not apt"

?

Avnish Kabaj

@Gaurang Yes

Gaurang Tandon

in solution it doesn't mention E2 anywhere though :/

Avnish Kabaj

@GaurangTandon ¯\_(ツ)_/¯

Lemme see

Gaurang Tandon

05:41

nvm

do you know anything about Q10?

anwer is "(d) informative questions (all are correct)"

Avnish Kabaj

@GaurangTandon I think so

Gaurang Tandon

@AvnishKabaj i don't know why a and b are true

does clayden mention about this?

Avnish Kabaj

@GaurangTandon you do know that Sn2 leads to inversion

That was for (b)

Gaurang Tandon

@AvnishKabaj yeah but this question is about SN1

Avnish Kabaj

@GaurangTandon but b part is on the basis on sn2

Strong nucleophiles do SN1

Weak sn2

That's from clayden

Gaurang Tandon

05:50

@AvnishKabaj i think part (b) is based on the fact that even in sn1 the product composition is not exactly racemic but rather 55:45 in favor of inversion

?

Avnish Kabaj

@GaurangTandon SN1 is actually loose SN2

Could be because of that

Gaurang Tandon

@AvnishKabaj :-O

links to read about this quote?

Avnish Kabaj

I have no idea

Maybe something from stackexchange

Gaurang Tandon

ok nvm

Avnish Kabaj

Or somewhere burrowed In Peter Sykes/clayden

Gaurang Tandon

05:54

check out q7

see its solution

compounds A and B are given enantiomer

though they have plane of symmetry :(

Avnish Kabaj

@GaurangTandon that simply removes one meso form

Wait no

I think you're correct

Yeah those 2 are diastereomers

But

So it's correct

Gaurang Tandon

oh god

sorry!

Avnish Kabaj

The question is asking for diastereomers only

Gaurang Tandon

yeah nvm

accha do you know where in clayden they've explained that a bridgehead carbanion is unstable?

i think it should be stable

but can't find any relevant page

Avnish Kabaj

06:13

@GaurangTandon bridgehead carbanions aren't unstable

Gaurang Tandon

@AvnishKabaj see this chemistry.stackexchange.com/q/36950/5026

Avnish Kabaj

That's a carbocation not not a carbanion

The reason is that the hybridizations changes

I.e becomes planar

Gaurang Tandon

the OP there mentioned that carbanions are unstable

and the answer poster took no effort in explaining that it actually is stable

Avnish Kabaj

Because to my knowledge carbanions aren't unstable

Gaurang Tandon

i agree with you

but i can't find any text saying that they are stable or unstable

Avnish Kabaj

06:21

@GaurangTandon my fiitjee teacher has a PhD man

I believe whatever she says

Generally

Gaurang Tandon

well

"Carbons
at bridgeheads, although extremely reluctant to undergo reactions in which they
must be converted to carbocations, undergo with ease reactions in which they must be
carbanions and stable bridgehead carbanions are known."

Avnish Kabaj

She specifically said bredt's rule isn't for carbanions

Gaurang Tandon

March mein I found this text

finally

Avnish Kabaj

Gud gud

Tanuj

bredts say the bridge head carbon shouldn't be sp2 hybridised , so a carbanion should have no problem with it

Avnish Kabaj

06:27

I don't like March

No pretty pictures

Gaurang Tandon

@AvnishKabaj yeah it's a dull

book

@Tanuj yep, I should write an answer to that question

Tanuj

@GaurangTandon cool

Gaurang Tandon

@[any-chem-college-grad-phd-people]

how do you get a link to this type of reference: "Streitwieser, Jr., A.; Young, W.R. J. Am. Chem. Soc. 1969, 91, 529"?

i come across them quite often in old books or research papers

when I paste the text in Google, nothing proper comes up

i'm just asking for the link to the research paper

similar to this - pubs.acs.org/doi/pdf/10.1021/jo01097a026

Avnish Kabaj

07:57

@GaurangTandon @Tanuj what Happened to that new room

Gaurang Tandon

08:19

@AvnishKabaj it's still there

check your browser history for the url

Avnish Kabaj

Tips and tricks

Gaurang Tandon

@AvnishKabaj i gave you a ping

you should get it in your notif inbox within 30min

1,3-feeds

09:19

0

Q: Consider flagging low quality answers as VLQ/NAA instead of just downvoting them

Google has a habit of displaying cards, and I am sure several of you have seen these by now: (search link) The way I understand the purpose - of displaying cards for each answer (and not just the accepted answer) - is that it helps the viewer to get alternative ideas about the question, and t...

Gaurang Tandon

@1,3-feeds here, another one for you @M.A.R. ;P

M.A.R.

09:38

RIP Stephen Hawking :(

5

Dang

@GaurangTandon I'll be the first to congratulate you for being able to cast close votes \o/

Well, then it sounds like Usanovich, and also why his theory wasn't successful. Reasoning in vein of BiH3 barely holds to its protons and looses them in oxidation would be much better on your part. — Mithoron 13 hours ago

@Mith molecules don't have digestive systems

So they can't loose, can they?

Haha this typo never gets old

Poor oxidant gets loosed on

M.A.R.

10:00

@Gau I approved your tag wiki edits, but I can't really rule out the density question as OT

We'd need a third opinion

And a fourth, fifth, sixth and seventh

Gaurang Tandon

11:42

@M.A.R. many thanks :)

@M.A.R. you want to support several questions about buoyancy on chem.se? ;)

Tanuj

12:04

@GaurangTandon Bro , have you been taught screw gauge and vernier calipers ?

Gaurang Tandon

@Tanuj i mean, in class 10th yeah

my teacher took almost no interest in that piece

have to study it from somewhere myself

Tanuj

@GaurangTandon When will you ?

Let me know when you will , I gotta do those topics too.

Gaurang Tandon

@Tanuj it's an uninteresting topic, probably next week :/

yeah sure

Tanuj

okay

Avnish Kabaj

@Tanuj it's given pretty well in dcp

If you own dcp

Tanuj

12:13

@AvnishKabaj I don't have mechanics part 1

@AvnishKabaj If possible , can you click pics of that topic and share it here ? I've searched it all over the internet , and I still am not sure what I'm doing when I solve the its problems.

Gaurang Tandon

yeah me too @AvnishKabaj

if you can do that, it'd be great; diff sources always give some thing diff

i am just looking for the bunch of formulae to use in such problems

Tanuj

It'd be a great help and would save us a lot of time.

Gaurang Tandon

12:42

is there any way to filter out unnecessary questions from the close vote review queue?

like I don't want to see questions about nano spectrometry

or transition metal catalysts

i am a simple guy

Avnish Kabaj

Later on when I'm free

Apoorv Potnis

@GaurangTandon Can you correct $\ce{OH}$ to $\ce{OH-}$?

0

Q: Why does pOH increase when pH decreases?

Let's say you add $\ce{HCl}$ to water. The $\ce{H+}$ ion concentration increases and that causes a decrease in $\mathrm{pH}$. But why would the $\mathrm{pOH}$ increase? I can't see why added $\ce{H+}$ ions will decrease the $\ce{OH}$ concentration? Is this because of the water auto-ionization? I...

physical-chemistry acid-base ph

Gaurang Tandon

@ApoorvPotnis on it

Apoorv Potnis

okay

@GaurangTandon WOW, you are pretty fast!

Gaurang Tandon

@ApoorvPotnis editing posts is my most favorite work if you didn't already notice ;)

Apoorv Potnis

12:54

@GaurangTandon Are you going to give JEE?

Gaurang Tandon

@ApoorvPotnis i did fill in the application form :P

Apoorv Potnis

@GaurangTandon 12th or dropper

?

Gaurang Tandon

12th dude

Apoorv Potnis

@GaurangTandon Aiming for IITs?

Gaurang Tandon

@ApoorvPotnis yeah :)

Apoorv Potnis

12:57

CS?

looking from your profile...

Gaurang Tandon

ofc

CS

Apoorv Potnis

Good

All the best

Gaurang Tandon

thanks :)

you're also giving right?

jee

Apoorv Potnis

Yeah

Gaurang Tandon

so good luck to you too :D

Apoorv Potnis

12:59

Thanks

Avnish Kabaj

Is diels alders in Alkenes?

Is it

Gaurang Tandon

i think not

Avnish Kabaj

That's good news

Gaurang Tandon

hehe

Apoorv Potnis

13:16

@GaurangTandon I've suggested a minor edit.

chemistry.stackexchange.com/review/suggested-edits/75396

Gaurang Tandon

@ApoorvPotnis thanks dude

i was myself wondering how to fix that upright x

looks good now :)

Apoorv Potnis

@GaurangTandon But I still don't know how to adjust the equilibrium and plus sign.

Gaurang Tandon

let me fix that

check now ;)

Apoorv Potnis

perfect

Gaurang Tandon

:D

Avnish Kabaj

13:34

@GaurangTandon@Tanuj what's the ultimate question bank as in questions in jee syllabus but next level difficult

@GaurangTandon what's your expected rank in jee

Tanuj

@AvnishKabaj I'm def not the right person to ask this , and according to me , you don't need to go for 'tough' questions anymore.

Avnish Kabaj

@Tanuj true that

I've been imbibing that policy for the past year but I think that it's time to step up

Tanuj

hmm , its your wish . Where do you do past years from ? Is there any website ?

Avnish Kabaj

@Tanuj I have the fiitjee past year question book

Tanuj

ok

hBy2Py

13:48

@GaurangTandon Paste the citation into Google Scholar search:

I believe the header links in blue for the search results are the type of URLs you want.

With Windows & Chrome, 'Copy link address' within the right-click menu plucks them out straightforwardly.

Avnish Kabaj

@Abcd This phase test is all india.(3)

Gaurang Tandon

14:20

@AvnishKabaj idk

@hBy2Py oh thanks a lot! :D you won't believe how many half-hours of frustration you have saved me

it is surprising though: pasting the same text into google search doesn't work, but in scholar search it does

duh

hBy2Py

14:36

Yeah, it's interesting how different the two searches behave.

Abcd

14:48

@AvnishKabaj Which phase test? Reshuffling test you mean?

M.A.R.

@GaurangTandon I've been meaning to read it like, 10 times now but it bores me right in the beginning

It has got to have a bore charm

Avnish Kabaj

@Abcd yeah

Abcd

@AvnishKabaj Maths is freaking me outttttttttttttt

What do I do?

I feel dead

Avnish Kabaj

@Abcd boi I never focus on math

Jo bas ki nai woh karna hi nai

Abcd

@GaurangTandon How did you do that those tough cengage questions!

I am not able to even move one of the complex numbers questions.

@AvnishKabaj Liar -_-. You got AIR 170!

Avnish Kabaj

14:57

@Abcd tbh it's nothing amazing

I won't even make it to a decent IIT

With that

Study math man

Study math

Abcd

@AvnishKabaj Cengage Questions are just too difficult.

Avnish Kabaj

If you can't do tough questions in 10 mins then you gotta accept that and do simpler ones

In some chapters I do RD Sharma

Because math bas ki nai

Gaurang Tandon

@Abcd just need experience

in 12th mid you'll find them to be really easy

Abcd

@GaurangTandon What sort of experience?

I feeel mad right now.

I could do PandC and Binomial but COMPLEXXXX

Its blood sucking

Gaurang Tandon

@Abcd complex involves some conics part, some quadratics part, so you've got to get both of those parts strong

i did complex in 12th class

fairly easy

why are you both doing it in 11th instead :/

Abcd

15:02

@GaurangTandon It was taught in 11th becoz

ANd My conics is also weak

Gaurang Tandon

@M.A.R. have faith in yourself that you can read that big mountain of text entirely in one go, and you will succeed... ;)

@Abcd duh, well, you need experience, that's all I'd say

i did it in class 12th, and found nothing extraordinary in it

i guess you would too

M.A.R.

The Periodic IIT whine

Avnish Kabaj

@M.A.R. better than having a dead periodic table

Gaurang Tandon

@M.A.R. sometimes I find there are more high school students here on chat than grad or prof chemists

so such talk is naturally expected

M.A.R.

2

Q: Is identifying a chemical equivalent to be able to produce it?

This question is a follow up of another thread, where we are discussing Theresa May's accusation of the Russian government which is supposedly behind the recent chemical attack in Great Britain. Soon, after the attack the Great Britain implemented a chemical analysis which again supposedly shows...

everyday-chemistry

Next HNQ

@AvnishKabaj carry on

I just find the discussion like bunch of astronauts trying to figure out how to calibrate their jetpacks

Avnish Kabaj

15:11

J

E

M.A.R.

Not interested

Avnish Kabaj

Looks like there's a no spam filter over here

M.A.R.

@AvnishKabaj I disagree

@AvnishKabaj chat?

Avnish Kabaj

@M.A.R. yup

M.A.R.

@AvnishKabaj nope

Avnish Kabaj

15:12

Yep

K

M.A.R.

There are flags though

And kicks

And suspensions

Avnish Kabaj

K

M.A.R.

And murders

Avnish Kabaj

K

gfycat.com/CleverSoggyLadybird

Abcd

@AvnishKabaj Where did you do Complex from?

Avnish Kabaj

15:15

@Abcd don't ask me haven't mastered it

But I use TMH

Abcd

@AvnishKabaj Ah, the book with questions tougher than in Cengage! Great job dude!

Avnish Kabaj

@Abcd it does?

My math isn't good

Abcd

@AvnishKabaj yes

Avnish Kabaj

It's generally below the average top ten

Abcd

@AvnishKabaj average top 10?

Avnish Kabaj

15:20

@Abcd non sankalp kids

In my center

Abcd

@AvnishKabaj You mean its generally used by "students below the top ten".

Avnish Kabaj

@Abcd didn't get that

Abcd

5 mins ago, by Avnish Kabaj

It's generally below the average top ten

What does this mean?

Avnish Kabaj

@Abcd the top ten kids

Take the avg of their math marks

Mine is lower than that

@M.A.R.

The spam filter

ron

15:57

Hi

Avnish Kabaj

Hello there

Abcd

Hi Ron :-)!

ron

How are you today? Studying chemistry?

Avnish Kabaj

I hope you haven't come to scold us kids

Abcd

I am fine. Up with Maths right now.

ron

16:02

not at all, you are the new blood

Avnish Kabaj

That's a relief

I just started editing stuff again

ron

@Abcd, did you get that question answered that you mentioned a while back in chat?

Abcd

@ron In the room for gaurang and you? Well, there I was asking if I could consult you with my general Organic Chemistry questions.

ron

Yes, that's was I was thinking of

Why not jost post them on the main site?

@GaurangTandon I like your recent carbocation 1,2 hydride shift question.

chemistry.stackexchange.com/questions/92235/…

I think the barrier for 1,2 hydride shifts is usually fairly low, 10 kcal/m give or take. So I think A will try to equilibrate with B, and I think they likely have similar energies. In any case, as soon as any B is formed it will likely be siphoned off by a second 1,2 hydride shift to form a more stable tertiary carbocation.

Abcd

@ron Coz many times the questions go unanswered.

ron

16:12

@Abcd That's unfortunate. Back in the day most questions were answered. I notice now that many do go unanswered.

ron

16:28

Nice chatting with you both. I'm heading out for a bike ride so see you later.

Emilio Pisanty

0

A: Ch-ch-ch-changes: Left nav, responsive design, & themes

Please reconsider your decision on voting buttons The voting buttons are an ever-present aspect of a bunch of sites' graphical identity, and they pull a disproportionate amount of weight in making the theming feel like a complete skin rather than just some surface-level attributes. My main site ...

^ consider supporting =)

Gaurang Tandon

@ron i'm really glad you liked it :D

@ron that's very interesting, i never knew of the energies before; actually, the fact that you mentioned multiple subsequent shifts, reminds me of this question, which really deserves much better answers than it currently has

@EmilioPisanty Having a humble level of participation in at least more than one SE site, I can easily say that these vote buttons subconsciously remind me which site I am on, and give me a feeling of being "at home"

Emilio Pisanty

@GaurangTandon indeed

Gaurang Tandon

@ron yep, that's right. I mean, five of questions in the past month have a positive score but zero answers (a, b, c, d, e). I understand some of them may not have fuller answers, or some may require some level of abstraction (cont)

Emilio Pisanty

@GaurangTandon how can questions have positive score and zero score simultaneously? =P

Gaurang Tandon

16:42

given a high schooler perspective; but I still think they deserve to be answered; but I don't know if this is the year of academia where all the grads/undergrads/profs are busy preparing their thesis or final year project, so several people may be busy around here

@EmilioPisanty whoops, fixed :P

hBy2Py

19:44

@GaurangTandon This is one of the main aims of the SE network -- to be one of the first search results, and to have good information to supply there.

M.A.R.

@ron hi sensei ron!

@EmilioPisanty whoa, so many cool guys/gals in our chat today

@EmilioPisanty I did. 50 bucks

@hBy2Py em-dash would probably be ---

Admittedly, I have forgotten what our vote buttons look like

hBy2Py

20:26

@M.A.R. Yeah, I badly abuse my dash types. It's one of the sets of punctuation rules that I never learned all that well.

Also, I think when I've looked it up before, I thought the official rules made everything look weird, so I've not ever tried to do it "right".

Transcript for