The repeating unit of polystyrene is

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$- {CH}_{2} - \underset{}{CH} C N$

$- {CH}_{2} - \underset{}{CH} Cl$

$- {CH}_{2} - \underset{}{CH} C_{6} H_{5}$

$- {CF}_{2} - {CF}_{2} -$

answer is B.

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Detailed Solution

Polystyrene has a chain where the substituent R is a phenyl group (C₆H₅), corresponding to a benzene ring minus one hydrogen: $- {CH}_{2} - CH (C_{6} H_{5}) -$ is the repeating unit in polystyrene.

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