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During the free-radical polymerization of ethene using benzoyl peroxide as an initiator, which of thPolymers Chemistry Question

Question

During the free-radical polymerization of ethene using benzoyl peroxide as an initiator, which of the following acts as the primary chain-initiating radical that first attacks the ethene monomer?

Answer: B

💡 Solution & Explanation

Benzoyl peroxide undergoes homolytic cleavage to form two benzoyloxy radicals, which rapidly undergo decarboxylation (loss of $CO_2$) to form highly reactive phenyl radicals ($C_6H_5^\bullet$). The phenyl radical then attacks the double bond of ethene to initiate the chain.

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