[Solution from source] Nylons such as nylon-6,6 are formed by condensation of a diamine with a dicarboxylic acid, producing amide (–CO–NH–) links, so nylon is a polyamide. Polyesters like terylene have ester links instead. Answer (3).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.