The group present in waxes are:

Ester group

The answer is (2) ester group.

Waxes are a type of lipid that is composed of long-chain fatty acids and long-chain alcohols. The fatty acids and alcohols are linked together by ester linkages. Ester linkages are formed when the carboxyl group of a fatty acid reacts with the hydroxyl group of an alcohol. Acid groups, alcoholic groups, and ether groups are all present in waxes, but the ester group is the most important. The ester group is responsible for the waxy texture and water-repelling properties of waxes.