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NEET levelSingle correct optionDifficulty 1 of 3pl193

Which of the following is commonly used as a free radical initiator for the addition polymerisation of ethene at high pressure?

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

Answer: C

Benzoyl peroxide (or a trace of dioxygen) undergoes homolysis of the weak

O - O

bond to give radicals that start the chain.

TiCl X_{4} / Al (C X_{2} H X_{5}) X_{3}

is Ziegler-Natta,

NaNH X_{2}

is anionic and

BF X_{3}

/water is cationic.

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