very urgent..... carboxylic acid....

JEE Main 2015 Papers › Organic Chemistry questions › very urgent..... carboxylic acid....

1) CH3COOC2H5 + C2H5ONa â†’ (A) â†’ iodoform reaction â†’ (B) + (C)

2) correct order of increasing rate of hydrolysis of the foll compounds : (gv reasons)
i) CH3COOEt ii) C2H5COOEt iii) iso-propyl-COOEt

3) when propanoic acid is treated with aqueous sodium bicarbonate, CO2 is liberated..
the CO2 comes from ---
i) COOH group
ii) methylene group
iii) bicarbonate
iv) methyl group

#Chemistry #Organic Chemistry

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20 Answers

33

Abhishek Priyam ·2008-10-21 07:19:27

Oh got it, rkn in Q1 is Perkin Rkn type.

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33

Abhishek Priyam ·2008-10-22 11:03:04

yes ur right, i will look into those at last..............

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1

voldy ·2008-10-22 10:56:57

It can be asked in matching

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33

Abhishek Priyam ·2008-10-22 10:52:57

I said perkin rkn type, not perkin rkn, i forgot its name, what is there in name when reactants are acid anhydride call it perkin and when ester call it claisen condensation..........

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1

voldy ·2008-10-22 10:41:45

It's not perkin reaction . It's claisen condensation for synthesis of Î²-ketoesters. the mechanisms fine.

I think that you're answer is rihgt . Which book? If it's Arihant don't trust the solns. w.r.t the rate of hydrolysis.

Hydrolysis is generally governed by steric factors , than polar effects.
For acid hydrolysis , that is the answer . If it's base catalysed , Claisen condensation product if definitely major.
In that also , your order for hydrolysis is fine.

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1

skygirl ·2008-10-22 07:38:55

THANK YOU!!

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33

Abhishek Priyam ·2008-10-22 05:20:38

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33

Abhishek Priyam ·2008-10-22 05:19:53

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33

Abhishek Priyam ·2008-10-22 05:04:05

Ok i am posting the mechanism.........

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1

skygirl ·2008-10-21 19:46:33

@manish..
will u pls explain me how did u get the product A of Qno.1.

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1

skygirl ·2008-10-20 21:48:36

well, i want confident answers...

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33

Abhishek Priyam ·2008-10-21 07:09:29

the answer given probably would have been of acid catalysed...

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1357

Manish Shankar ·2008-10-21 05:44:14

In Q.1
A is CH₃COCH₂COOC₂H₅
B is Na^+-OOCCH₂COOC₂H₅
C is CHI₃

In Q.3
CO₂ comes from NaHCO₃
CH₃CH₂COOH+NaHCO₃â†’CH₃COO^-+Na+CO₂+H₂O

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1

skygirl ·2008-10-21 05:29:22

dats y i posted this question...
coz if some confident banda gives n ans,,, i can assure myself that one given in book is wrong

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1

skygirl ·2008-10-21 05:25:22

ok
but i am sry to say... u ARE away from correct ans...
i too thot like you,,,,, but the ans is 3>2>1.

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62

Lokesh Verma ·2008-10-21 05:10:56

sky .. unfortunately, i am not good enuf in chemistry... unfortunately, I cant give "confident" answers to this one...

I may sometimes (actually more than that) be far far from the correct answer :)

But i will get the other guys to the task :)

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33

Abhishek Priyam ·2008-10-21 05:05:00

In Q.1 can't figure out A it is coming out same as reactant.

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33

Abhishek Priyam ·2008-10-21 05:02:37

Q.3 CO₂ comes from NaHCO₃

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33

Abhishek Priyam ·2008-10-21 05:00:16

Q.2 (considering base catalysed hydrolysis)

i)>ii)>iii)

consider electron density on carbonyl carbon and steric hindranceon adjacent carbon.

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1

skygirl ·2008-10-21 04:49:20

HEY Y NONE OF U GUYS ARE ANSWERING THIS ONE???
THESE ARE NOT AT ALL TOUGH!!
I JUS' WANNA SEE IF I AM RIGHT OR WRONG....

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Your Answer

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