The compound shown is polymerised by free radical addition polymerisation (1,4-addition). Select all correct statements about the product.

AThe polymerisation is chain-growth addition
BThe product is a thermosetting plastic
CEach repeat unit retains one C=C bond
DOne molecule of HCl is eliminated per monomer added

Answer: A, C

2-Chlorobuta-1,3-diene (chloroprene) gives neoprene by chain-growth addition. The 1,4-addition leaves one C=C in each repeat unit, -CH2-C(Cl)=CH-CH2-. Neoprene is an elastomer, not a thermosetting plastic, and no HCl is eliminated because the Cl atoms stay on the polymer.

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