1
MCQ (Single Correct Answer)

AIPMT 2014

Which one is most reactive towards nucleophilic addition reaction?
A
B
C
D

Explanation

Electron withdrawing (–I, –M) groups are more reactive towards nucleophilic addition reactions. Thus, correct order is :
2
MCQ (Single Correct Answer)

NEET 2013

Reaction by which benzaldehyde cannot be prepared
A
B
C
D

Explanation

3
MCQ (Single Correct Answer)

NEET 2013

The order of stability of the following tautomeric compounds is

A
II > I > III
B
II > III > I
C
I > II > III
D
III > II > I

Explanation

Enolic form predominates in compounds containing two carbonyl groups separated by a –CH2 group. This is due to following two factors.

(i) Presence of conjugation which increases stability.

(ii) Formation of intramolecular hydrogen bond between enolic hydroxyl group and second carbonyl group which leads to stablisation of the molecule.

Hence the correct answer is III > II > I
4
MCQ (Single Correct Answer)

AIPMT 2012 Prelims

Predict the products in the given reaction.

A
B
C
D

Explanation

EXAM MAP

Joint Entrance Examination

JEE Advanced JEE Main

Medical

NEET

Graduate Aptitude Test in Engineering

GATE CE GATE ECE GATE ME GATE IN GATE EE GATE CSE GATE PI