Which one of the following is a free radical initiator for addition polymerisation?

A $BF X_{3}$ with a trace of water
B $NaNH X_{2}$ in liquid ammonia
C $TiCl X_{4}$ with $Al (C X_{2} H X_{5}) X_{3}$
DBenzoyl peroxide

Answer: D

Benzoyl peroxide has a weak O-O bond that breaks homolytically to give radicals. The others start cationic, anionic and coordination (Ziegler-Natta) polymerisation respectively.

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