Which is an example of thermosetting polymer?

Thermosetting polymers are cross-linked or heavily branched molecules, which on heating undergo extensive cross-linking in moulds and become infusible. They cannot be reused.

Bakelite is formed by the condensation reaction of phenol with formaldehyde, resulting in a highly cross-linked thermosetting polymer.

Polystyrene and Polyvinyl chloride are thermoplastic polymers, while Nylon 6,6 is a fibre.

Answer: Bakelite