1.

The polymer polystyrene has the repeating unit :

Answer»

`-CH_2-UNDERSET(CN)underset(|)(CH)-`
`-CH_2-underset(C_6H_5)underset(|)(CH)-`
`-CH=CH-underset(C_6N_5)underset(|)(CH)-`
`-CH=underset(C_6N_5)underset(|)(C)-`

Answer :B


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