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Q.

The repeating unit of polystyrene is

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a

−CH2−CH                 CN

b

−CH2−CH                 Cl

c

−CH2−CH                 C6H5

d

−CF2−CF2−

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: −CH2−CHC6H5- is the repeating unit in polystyrene.

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