Which of the following is an example of a monomer used in copolymerisation?

Vinyl acetate is indeed an example of a monomer used in copolymerization. In the context of polymer chemistry, a monomer is a small, simple molecule that can join together with other similar molecules to form a polymer. Copolymerization involves combining two different types of monomers to create a copolymer, which exhibits properties derived from both monomers.

Vinyl acetate is commonly used in copolymerization processes due to its reactivity and ability to incorporate into other polymer structures, resulting in materials with enhanced physical and chemical properties.

In contrast, the other options listed—polyethylene, polystyrene, and polypropylene—are all polymers rather than monomers. These materials are the end products of polymerization processes and not building blocks used in creating copolymers. Understanding the distinction between monomers and polymers is crucial for grasping how copolymerization works and the nature of plastics and synthetic materials.