What functional group(s) must be present in a monomer of a condensation reaction?

http://en.wikipedia.org/wiki/Condensation_polymer

To determine the functional group(s) needed in a monomer for a condensation reaction, we need to understand the process of condensation polymerization.

Condensation polymerization is a reaction in which two or more monomers combine to form a polymer with the release of a small molecule, such as water or an alcohol. In this reaction, the functional group(s) required in the monomer(s) are those that can react with each other through a condensation reaction.

The most common functional group involved in condensation reactions is the hydroxyl group (-OH). Monomers containing hydroxyl groups can react with other monomers through a reaction called esterification, resulting in the formation of an ester linkage and the liberation of water molecules.

Other functional groups that can participate in condensation reactions include carboxyl groups (-COOH), amino groups (-NH2), and amide groups (-CONH2). These functional groups can undergo reactions like esterification, amidation, or urea formation, leading to the formation of polymer chains.

In summary, the functional group(s) required in a monomer for a condensation reaction are typically hydroxyl groups (-OH), but other functional groups such as carboxyl groups (-COOH), amino groups (-NH2), or amide groups (-CONH2) can also be involved depending on the specific reaction.