Dacron is an example of

polyesters

Dacron is an example of 4. polyesters.

Dacron is a synthetic fiber that is often used in clothing and textiles. It is also known as terylene. The monomers of dacron are ethylene glycol and terephthalic acid. These monomers react to form a polymer with an ester linkage. The condensation reaction produces water as a byproduct.

Polyamides are polymers that contain both amide and amine groups. Polypropenes are polymers that contain only propene monomers. Polyacrylonitrile is a polymer that contains only acrylonitrile monomers.

So, Dacron is a polyester, not a polyamide, polypropylene, or polyacrylonitrile.