A short fragment of the polymer chain (two repeat units, end groups shown) is drawn. Which monomer, drawn among the structures shown, gives this polymer by addition polymerisation?

AStructure A
BStructure B
CStructure C
DStructure D

Answer: B

The chain has a phenyl group on every second backbone carbon and an all-carbon backbone, so it is polystyrene. Opening the C=C of styrene (phenylethene) gives -CH2-CH(Ph)- units. Ethylbenzene has no double bond and cannot polymerise, and the other two are not the monomer that gives this repeat unit.

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