The monomer shown undergoes chain-growth addition polymerisation (end groups drawn as H and CH3). Which of the structures shown is a short fragment of the polymer chain (two or three repeat units)?

AStructure A
BStructure B
CStructure C
DStructure D

Answer: C

Propene gives polypropylene, whose repeat unit is -CH2-CH(CH3)-: a methyl branch on alternate backbone carbons. The unbranched chain is polyethylene, the gem-dimethyl chain is polyisobutylene (from 2-methylpropene) and the ethyl-branched chain is poly(1-butene).

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