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

Compounds that can exhibit tautomerism, are:

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

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.

CH₃CHO and C₆H₅CH₂CHO can be distinguished by:

1. Benedict test

2. Iodoform test

3. Tollen's reagent test

4. Fehling solution test

Which acid doesn't exhibit optical isomerism?

1. Maleic acid

2. $\alpha$-amino acid

3. Lactic acid

4. Tartaric acid

The product 'D' in the below-mentioned reaction will be:

1.		2.
3.		4.

The example of a nucleophilic substitution reaction among the following is:

1.
2.
3.
4.