Select all the copolymers among the following.

ABuna-N
BPHBV
CBuna-S
DNeoprene

Answer: A, B, C

Buna-S (butadiene and styrene), Buna-N (butadiene and acrylonitrile) and PHBV (two hydroxy acids) each contain two different monomer units. Neoprene is the homopolymer of chloroprene.

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