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JEE Main levelSingle correct optionDifficulty 2 of 3pl219

In the initiation of free radical polymerisation by benzoyl peroxide, the first step is

Ahomolysis of the $O - O$ bond to give two benzoyloxy radicals
Babstraction of a hydrogen atom from the monomer by $CO X_{2}$
Cheterolysis of the $O - O$ bond to give an anion and a cation
Daddition of the peroxide across the $C = C$ bond of the monomer

Answer: A

The weak

O - O

bond in benzoyl peroxide breaks homolytically on heating, giving two

C X_{6} H X_{5} COO

radicals (which may lose

CO X_{2}

to give phenyl radicals). These radicals then add to the monomer double bond to start the chain.

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