JEE Chemistry Club

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Jasmine

06:08

@111 isnt 12 only major here (as the picture suggests)

Fancy-Toon

06:31

why isn't there any discussion over the Jee mains exam?

111

06:51

@Jasmine no that's 1,4-Adduct not 1,2-Adduct.

2 hours later…

Fancy-Toon

08:49

@111 The pi-bond shift after carbocation formation on the C below O, leads to a more stable carbocation at the benzyl position..

so, 1-4 product should be more stable here.. but in general too, I've seen always in EAS rxn's 1-4 addition is considered more stable being the thermodynamics controlled product

111

@Fancy-Toon " 1,4-addition product is major and 1,2 addition minor product" is a general statement for apha-beta unsaturated ketones .So, i don't think there is any role of the statement you stated above.

Fancy-Toon

Yes, you 're right..I'm searching the actual reason-_-

111

@Fancy-Toon Can you answer by basicity question?Plz.

Fancy-Toon

09:05

@111 Ya, A is definitely more basic..

steric hindrance may be there in B , but you know resonance is the game changer

111

thanks,

@Fancy-Toon in which class are you??

Fancy-Toon

Dropper bro..

111

i'm in 11

Fancy-Toon

preparing for advanced! -_-

@111 oh!!

111

All The Best!!

Fancy-Toon

09:08

thanks

111

@Fancy-Toon best book for Jee advance organic concepts theory .

Fancy-Toon

It depends .. for question solving generally Ms chauhan is preffered..but u can go with cengage organic(for relevance with jee) and jonathan clayden..

111

Is MS Chahauhan organic theory enough for Jee Advanced??@Fancy-Toon

Fancy-Toon

Clayden is the best "I feel" for getting basics right..

111

is there any indian version of clayden?

Fancy-Toon

09:14

@111 Ms chauhan's two books are available in market one is for the indian version of solomons ( for theory ) and the the other one is Balaji's publication one which only consists of problems..

@111 no indian version of clayden

111

ok!! thanks for giving your time

Fancy-Toon

oh, no issues..:)

2 hours later…

Jasmine

11:27

@PolarBear Hello !

@PolarBear how did you utilize the time from January

2 hours later…

Yuvraj Singh...

13:16

@Jasmine how was jee?

Yusuf Hasan

14:11

@111 Hi

First of all

I wanna make this crystal clear

Basicity has ABSOLUTELY NTHG to do with steric hindrance

Because it's a thermodynamic concept

While nucleophilicity is a kinetic concept

What this means is that, nucleophilic reactions have to occur fast,so steric hindrance matters

While basic reactions have technically a lotta time

So no need to look at steric hindrance here

Also @Fancy-Toon See this

It's not a very easy case to predict the basicity b/w aniline and pyridine based on qualitative arguments

Better to remember this than use questionable arguments like resonance is a game-changer

Eveb s character is a big thing

Fancy-Toon

15:11

@YusufHasan Oh! I'm sorry .. I will keep that in mind..thanks!

Yusuf Hasan

16:07

@111 @Fancy-Toon As for your reaction about the 1,4 and 1,2 adduct

Do you guys know the actual reason behind the 1,4 and 1,2 product,the HSAB reason?

If you do,you can easily see the logic for this reaction

2 hours later…

111

18:31

According to HSAB principle " hard acids prefer binding to the hard bases to give ionic complexes, whereas the soft acids prefer binding to soft bases to give covalent complexes. "

I don't think HSAB is reason for this because in case of alpha-beta unsaturated aldehyde 1,2-Adduct is major product.

E.g-