The order of reactivity of phenyl magnesium bromide (PhMgBr) with the following compounds:
A
III > II > I
B
II > I > III
C
I > III > II
D
I > II > III
Explanation
The reactivity of the carbonyl group
towards the nucleophilic addition reactions
depend upon the magnitude of the positive
charge on the carbonyl carbon atom (electronic
factor) and also on the crowding around the carboxyl carbon atom in the transition state
(steric factor). Both these factors predict the
following order
I > II > III
2
MCQ (Single Correct Answer)
AIPMT 2011 Mains
An organic compound A on treatment with NH3 gives B, which on heating gives C. C when treated with Br2 in the presence of KOH produces ethyl amine. Compound A is
A
CH3COOH
B
CH3CH2CH2COOH
C
D
CH3CH2COOH
Explanation
3
MCQ (Single Correct Answer)
AIPMT 2011 Prelims
In a set of reactions m-bromobenzoic acid gave a product D. Identify the product D.
A
B
C
D
Explanation
4
MCQ (Single Correct Answer)
AIPMT 2011 Mains
Match the compounds given in List-I with List-II and select the suitable option using the code given below.
List-I
List-II
(A)
Benzaldehyde
(i)
Phenolphthalein
(B)
Phthalic anhydride
(ii)
Benzoin condensation
(C)
Phenyl benzoate
(iii)
Oil of wintergreen
(D)
Methyl salicylate
(iv)
Fries rearrangement
A
(A)-(iv), (B)-(i), (C)-(iii), (D)-(ii)
B
(A)-(iv), (B)-(ii), (C)-(iii), (D)-(i)
C
(A)-(ii), (B)-(iii), (C)-(iv), (D)-(i)
D
(A)-(ii), (B)-(i), (C)-(iv), (D)-(iii)
Explanation
(A) Benzaldehyde (ii) Benzoin
condensation
(B) Phthalic anhydride (i) Phenolphthalein
(C) Phenyl benzoate (iv) Fries
rearrangement
(D) methyl salicylate (iii) Oil of
wintergreen
Questions Asked from Aldehydes, Ketones and Carboxylic Acids
On those following papers in MCQ (Single Correct Answer) Number in Brackets after Paper Name Indicates No of Questions
