1
MCQ (Single Correct Answer)

AIPMT 2012 Prelims

The correct order of decreasing acid strength of trichloroacetic acid (A), trifluoroacetic acid (B), acetic acid (C) and formic acid (D) is
A
B > A > D > C
B
B > D > C > A
C
A > B > C > D
D
A > C > B > D

Explanation

As –I effect increases, COOH group becomes more electron deficient and tendency to loose H+ ions increases i.e., acid strength increases. As +I effect increases, acid strength decreases. Thus, correct order of acid strength is
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 Mains

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
4
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

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