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(A) The reaction involves the free radical polymerization of styrene $(C_6H_5CH=CH_2)$ in the presence of dibenzoyl peroxide as an initiator. During p

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$I$

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(A) The reaction involves the free radical polymerization of styrene $(C_6H_5CH=CH_2)$ in the presence of dibenzoyl peroxide as an initiator. During polymerization,the double bond of the vinyl group breaks,and the monomer units link together to form a long chain. The structure of the repeating unit in polystyrene is $[-CH_2-CH(C_6H_5)-]_n$. Comparing this with the given options,structure $I$ represents the correct polymer structure.

The structure of the polymer obtained by the following reaction is

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