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1

NEET 2013

MCQ (Single Correct Answer)
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
2

AIPMT 2012 Prelims

MCQ (Single Correct Answer)
Predict the products in the given reaction.

A
B
C
D

Explanation

3

AIPMT 2012 Prelims

MCQ (Single Correct Answer)
Acetone is treated with excess of ethanol in the presence of hydrochloric acid. The product obtained is
A
B
C
D

Explanation

4

AIPMT 2012 Mains

MCQ (Single Correct Answer)
Consider the following reaction


The product A is
A
C6H5CHO
B
C6H5OH
C
C6H5COCH3
D
C6H5Cl

Explanation



It is Rosenmund’s reaction.

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Class 12