Which from following polymers needs peroxide as initiator for preparation?

Step-by-step solution

Analysis of polymer synthesis mechanisms: Nylon 6,6 is produced through condensation polymerization of hexamethylenediamine and adipic acid, requiring no radical initiator. Polyacrylonitrile undergoes addition polymerization of acrylonitrile ( CH₂=CH-CN ) via free radical mechanism, typically initiated by peroxides. Terylene forms through condensation polymerization of terephthalic acid and ethylene glycol, eliminating the need for radical initiators. Bakelite results from condensation polymerization of phenol and