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  4. The correct repeating structural unit of polystyrene is

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Q. The correct repeating structural unit of polystyrene is

Polymers

Solution:

The initiator free radical first adds to styrene to form more stable benzylic free radical (I) which then adds to another molecule to form another benzylic free radical (II) and so on and so forth. As a result, two $C_6H_5$ groups occur at alternate carbon atoms on the polymer chain.

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