« first day (10 days earlier)      last day (2224 days later) » 

1:05 AM
Ty
So finally I have:
Now $\ce{OH2}$ has to attack as a base. Which hydrogen will it take? @MollyCooL Any idea?
 
Arent all hydrogens equivalent?
Good morning! I just wokeup
 
@MollyCooL Good morning
@MollyCooL which hydrogen will OH2 attack, one of the ring or that of Methyl group
 
1:25 AM
Because of inductive effect of alkyl groups I feel it should be outer one
:(
 
By OH2 you mean water?
 
@MollyCooL yes
 
OH- in water should attack the +ve centre
What do you mean by which hydrogen will it take?
 
@MollyCooL $\ce{H2O}$ will serve as a base here
Look up the mechanism of dehydration of alcohols
 
OH!
 
1:33 AM
@MollyCooL OH- is too low ...
@MollyCooL its too low
 
yeah okay
 
@GaurangTandon Can you see please
 
Oh! You mean dehydration of alcohols to alkenes? Sorry i realised just now. But isnt it in an acidic medium?
 
3 mins ago, by Abcd
Look up the mechanism of dehydration of alcohols
@GaurangTandon @MollyCooL Thats my product, do you agree to it?
 
What else could it be? Elimination is what takes place here. So it should be right
Gaurang must be preparing day and night for mains
Ohhhh
as the answer?
 
1:43 AM
@MollyCooL 1,2 dimethyl cyclohexene
1 message moved to trash
1 message moved to trash
 
Mmmmmm
 
@MollyCooL i realised that the H atttached to C+ should be most acidic
 
True
 
Obvious right?
 
yes
 
1:47 AM
Stuck on such a stupid thing :P
Silly me
 
But then how do you get dimethyl
 
@MollyCooL trace the mechanism, rearrange the carbocation by hydride shift and ring expansion and you'll see :-)
 
I didnt even realise theres a H there
Oh! Okay.
Ring=benzene=(preoccupied)
 
2:04 AM
Gtg cya
 
12 dimethyl cyclohexyne ?
 
2:17 AM
@Abcd yep that's correct; where are you stuck?
ring expansion is there
oh ok nvm the discussion is long over
 
 
5 hours later…
7:38 AM
@Tanuj 2>1>3 seems apt
what's the answer given?
 
@GaurangTandon nvm let's avoid confusion , it must be that.
 
yep :)
 
8:29 AM
does anyone know whether 2p-2p overlap is better or 2s-2s?
internet has weird answers, and the two okayish I got have opposite answers (sakshieducation.com/EAMCET/Chemistry/1styear/BitBank/… and askiitians.com/forums/Physical-Chemistry/…)
i'm talking about both extent of overlapping and bond energy (hopefully the both are directly related)
okay I think this should answer it
3
Q: Predicting sigma bond overlap strengths of s-s, p-p, s-p, sp-sp etc

samjoeQ. How can we qualitatively predict $\sigma-$bond strengths of overlap between: $s-s$ $s-p$ $p-p$ $sp-s$ $sp-p$ $sp-sp$ etc.? My school-book says $s-s$ overlap bond strength is greater than $s-p$ overlap which is greater than $p-p$ Another book Inorganic Chemistry by JD Lee states this: ...

 
 
2 hours later…
10:18 AM
@GaurangTandon 2p- 2p overlap is much better
Source: JD Lee, OP Tandon's Inorganic CHemistry
@GaurangTandon yes
@GaurangTandon I never trust sites like askiitians, its horrible
 
10:57 AM
0
Q: Rearrangement of alkene

Abcd This is the process of dehydration of alcohols and it follows the $\mathrm{E1}$ mechanism in the rate determing step. My proposed mechanism for it is: In the third step, I have deprotonated the most acidic hydrogen. However, the answer given in my workbook is: I can't figure out...

@GaurangTandon @MollyCooL @DivyankaS.Chaudhari ^^^
 
11:10 AM
@Abcd oh thanks
@Abcd i know
chem.se will soon sun-set askiitians for high school queries
@Abcd you post your questions and then delete them :/
 
I commented
Then he deleted guess it was a silly mitsake
 
 
1 hour later…
12:46 PM
@GaurangTandon Please tell the mechanism of formation of product B in the picture:
 
1:01 PM
@Abcd just my opinion, feel free to do whatever you wish to, but I think now that conclusion has been reached, I'm sure you'll want to remove that meta post
@Abcd Idk myself; all I know is that it's oxidative ozonolysis, the mechanism of which is subject to an entire book (Criegee mech)
 
@GaurangTandon Deleted
@GaurangTandon $\ce{HC = CH - Cl + HCl -> ?}$
 
1,1-dichloroethane?
 
@GaurangTandon $\text{1,1,1- Trichloroethane}$
Why?
 
where is this given?
 
@GaurangTandon Fiitjee booklet
 
1:10 PM
a third chlorine shouldn't be added
:/
@Abcd it's definitely wrong
 
@GaurangTandon Their question compound doesn';t make sense
CH= CH-Cl , octet of carbon incomplete
 
ah yes
must be wrong question
BURN IT WITH PLEASURE!
 
yep :p
 
1:39 PM
@GaurangTandon For the elementary reaction $\ce{M -> N} $, the rate of disappearance of M increases by a factor of 8 upon doubling the concentration of M. The order of reaction with respect to M is?
According to me it should just be $1$ :/
Becoz the rxn is elementary
 
(i'll be back in half an hour, kindly wait)
 
Sid
1:53 PM
@Abcd You are actually correct.
But, the JEE answer-key for that idea listed it as 3.
It's one of those controversial JEE questions.
 
2:29 PM
I think I disagree @Sid. Unless we're given that M is actually an element and not just a shorthand for some compound, we cannot say that the reaction is elementary
moreover, it is clearly given that "increases by a factor of 8 upon doubling the concentration"
so we've to follow the experimental rate law
although I agree the confusion could've been avoided by writing "compound M -> compound N" instead
JEE questions are often poorly written
so it's best to closely follow what's explicitly written, and not implicitly assume anything,which in this case was: " increases by a factor of 8 upon doubling the concentratio"
 
Sid
@GaurangTandon The first line of the question says that the reaction is elementary
 
@Sid ahhh I totally missed it
dang I look so stupid now :(
 
@Sid It came in my FIITJEE test. Which JEE paper is it from?
 
Sid
@Abcd 2013
 
@GaurangTandon Who is more activating $\ce{CR3}$ or $\ce{CH3}$?
 
2:42 PM
@Abcd CH3 because of hyperconjugation
@Abcd actually "Which is"
 
@GaurangTandon Why not Who?
 
@Abcd Who is for real living organisms...
 
@GaurangTandon I know but...chemists talk that way if I am not wrong
 
@Abcd i haven't seen such an instance before
 
 
1 hour later…
3:59 PM
@GaurangTandon Why dont you ask that entropy thing on Main?
 
hmm let's see
 
4:39 PM
can anyone please verify the answer here? ^ i got it as (2) but it's said incorrect
 
Anonymous
5:04 PM
@GaurangTandon Isn't it supposed to be (1)?
 
Anonymous
By ideal gas eqn, T=40/R. W= -nRTln(V2/V1) = -5*R*(40/R)*ln(4/40)
 
Anonymous
Why that extra 100 :/
 
Anonymous
Oh, wait
 
Anonymous
It's asked maximum
 
Anonymous
And that is done in a irreversible process. So, final Pressure= 50 bar and W= -P(\delta V) = -50*(4-40) = 1800 L-bar
 
Anonymous
5:10 PM
That's (3). Mayyybe.
 

« first day (10 days earlier)      last day (2224 days later) »