The reaction of a carbonyl compound with one of the following reagents involves nucleophilic addition followed by the elimination of water. The reagents are:

1.	A Grignard reagent.
2.	Hydrazine in the presence of a feebly acidic solution.
3.	Hydrocyanic acid.
4.	Sodium hydrogen sulphite.

Compounds that can exhibit tautomerism, are:

1. l and ll
2. l and lll
3. ll and lll
4. l, ll and lll

The compound among the following that will not be soluble in sodium hydrogen carbonate is:

What is the order of the stability of the following tautomeric compounds?

1. III > II > I
2. II > I > III
3. II > III > I
4. I > II > III

Benzaldehyde cannot be prepared by:

1.
2.
3.
4.

Predict the products in the given reaction, 

1.		2.
3.		4.

Acetone is treated with excess ethanol in the presence of hydrochloric acid. The product obtained will be:

1.
2.
3.
4.

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

1. B > A > D > C

2. B > D > C > A

3. A > B > C > D

4. A > C > B >D