Monomers that can undergo condensation polymerization:

Condensation polymerization is a process in which monomers react together to form a polymer by the elimination of a small molecule, such as water or alcohol. This process involves the combination of two monomers, each with a reactive functional group, which leads to the formation of a covalent bond between the monomers and the release of a small molecule as a byproduct.

Out of the given options, the following monomers can undergo condensation polymerization:

a) Styrene:
Styrene is a monomer commonly used in the production of polystyrene. It contains a vinyl group (C=C) that can react with another styrene monomer by the elimination of a hydrogen atom, resulting in the formation of a covalent bond and the release of a small molecule. This process repeats to form a long chain polymer.

b) Glycine:
Glycine is an amino acid that can undergo condensation polymerization to form polypeptides. It contains both an amino group (-NH2) and a carboxyl group (-COOH) that can react with each other. The amino group of one glycine molecule can react with the carboxyl group of another glycine molecule, leading to the formation of a peptide bond and the release of a water molecule. This process repeats to form a chain of amino acids, which constitutes a polypeptide.

c) Isoprene:
Isoprene is a monomer that can undergo condensation polymerization to form natural rubber. It contains a double bond (C=C) that can react with another isoprene monomer by the elimination of a hydrogen atom. This reaction forms a covalent bond and releases a small molecule. The process continues, resulting in the formation of a long chain polymer of isoprene units.

d) Propene:
Propene, also known as propylene, is a monomer that undergoes addition polymerization rather than condensation polymerization. Addition polymerization occurs when monomers combine without the elimination of any small molecules. Propene has a double bond (C=C) that opens up and reacts with another propene monomer to form a covalent bond, resulting in the formation of a long chain polymer.

In summary, out of the given options, styrene, glycine, and isoprene can undergo condensation polymerization, while propene undergoes addition polymerization.