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00:18
@Abcd uhh, Samjoe was right in this case. Hyperconjugatiokn is a better activator than inductive effect
@Abcd yep, that's correct
All of your questions have been answered now right
@Abcd
 
3 hours later…
03:42
@GaurangTandon what's right? Deuteride shift?
@AvnishKabaj have you ever seen deuteride shift
@Abcd yes deuteride shift
04:20
@GaurangTandon Okay, this is the first time I saw it.
@AvnishKabaj @GaurangTandon ^
@Abcd A D
@AvnishKabaj Why not BC?
it should attack from less hindered site right?
04:35
I think attack on epoxides is through SN1 let me check
@AvnishKabaj Clayden page 352
Its given SN2
Ya
But they haven't attacked it with H+ first
@AvnishKabaj Now what?
20 secs ago, by Avnish Kabaj
But they haven't attacked it with H+ first
@AvnishKabaj no...
@AvnishKabaj they have made nucleophilic attack first
04:38
Yes
That's the difference
@AvnishKabaj ??
Wait
I'll draw the two mechanisms
None of the options are correct imo for the above question
I don't like himanshu pandey
@J_B892 is the answer d
I'm guessing there should be a OH opposite to Cl...
@AvnishKabaj Why so?
04:45
Or maybe they are talking about that specific configuration
@J_B892 is it or is it not
@AvnishKabaj Given answer is A
Ya they're talking about the specific configuration
And I don't remember what's threo/erythro
@AvnishKabaj I dont think carbocation forms...
Compounds with 2 adjacent chiral C atoms are threo- if OH on opposite sides, erythro- if OH on same side
You're not getting the answer by doing SN2 are you?
04:47
@AvnishKabaj The title of the worksheet is "SN2"
All the worksheets are in order of topics
Then I don't know
Imho it should be sn1
@AvnishKabaj Specific configuration of what?
5
Q: Why can't we rotate a carbon while checking for chirality?

Avnish KabajIf I were to rotate the front carbon clockwise by $60^\circ$, it would become achiral. But my text book says that it's chiral. Is it that rotating an individual atom about a sigma bond changes its conformation is that why we can't rotate it?

It's not relevant to your question
Hmm
04:54
Isn't the first compound active in Q26....The second compound has a plane of Symmetry
Base catalysed ring opening of eposixides is $\ce{S_N2}$
Acid catalysed ring opening of expoxides is $\ce{S_N1}$
@J_B892 first has CoS
@J_B892 2nd doesnt have POS IMO
So answer should be d, is it @J_B892?
@Abcd yess
05:22
@J_B892 threo erthyro is old nomenclature...ignore it
@Abcd it should lead through S<sub>N</sub>1 because H+ is also there, all questions I have done like this which have H+ are through SN1.
@AvnishKabaj Funny thing: I got that exact same conformation in my test. it asked "which of the following molecules is meso?" and in it one of the answers was that :P
it just indicates to us that such question are pretty useless
05:40
@GaurangTandon Why do you type "S<sub>N</sub>1"
I am unable to read it
type $\ce{S_N1}$ if you wish ... because that's rendered by mathjax
chat doesn't show S<sub>N</sub>1 in the way you want it to @GT
@GaurangTandon such questions were there in MSC also ...so ...
05:56
@Abcd oh right, i'd a habit
@Abcd well, they are, but they're still useless in the sense that they really don't teach you anything...
@GaurangTandon lol
 
3 hours later…
09:04
Hello
I have a question related to thermodynamics
My textbook says " Laws of thermodynamics apply only when a system is in equilibrium or moves from one equilibrium state to another equilibrium state"
Why so??
 
2 hours later…
11:10
@susanJ i also checked the PSS room, did your query get answered there? does seem there was a long winded discussion
 
5 hours later…
16:40
@GaurangTandon Why does inversion take place in pinacol rearrangement and why is anti arrangement necessary?
@Abcd give me an example
andi
@GaurangTandon every example
(and i'm going to sleep so expect a reply tomo)
idk what you mean by "anti arrangement"
@GaurangTandon :/ ... I'll send the example then ...
@GaurangTandon well the shifting group has to be anti right to -OH (which leaves as H2O) ?
Were you taught this?
@Abcd no, that anti-peri-planar thing was in E2 mech
16:46
@GaurangTandon I know about that.
Today, we were taught that its necessary in Pinacol too.
I'll get back to you with example(s)
 
2 hours later…
18:45
1
A: NGP mechanism vs the simple carbocation mechanism

Avnish KabajFrom Clayden (Chapter 37 Rearrangements page 976): Intramolecular reactions (including participation of a neighbouring group) that give three-, five-, or six-membered rings are usually faster than intermolecular reactions. It also gives the exact same example as your question: ...

@GaurangTandon You weren't taught NGP in resonance? If that's the case, then they left an important topic.
Anyway @GaurangTandon How does his answer not answer your question? What else are you looking for? Tell me so that I can answer that as an official answer...

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