Question

is a repeating unit for :

• A. Buna-N
• B. Acrilan
• C. Novolac
• D. Neoprene

Answer 1

Answer: (C)

Phenol $+H-\stackrel{\underset{||}{O}}{C}-H\stackrel{H^{+}}{\to }\underset{\text{ (Given stucture) Linear polymer }}{\mathrm{Novalac}}\stackrel{\text{ Polymerisation }}{\to }\underset{(\text{ 3D structures })}{\mathrm{Bakelite}}$