Identify the polymer obtained from acrylonitrile and 1,3-butadiene.

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Buna-N is a copolymer formed by the addition polymerization of 1,3-butadiene and acrylonitrile in the presence of a peroxide catalyst.

The reaction is:
$n CH_{2} = CH - CH = CH_{2} + n CH_{2} = CH (CN) \to [- CH_{2} - CH = CH - CH_{2} - CH_{2} - CH (CN) -]_{n}$

Buna-S is a copolymer of 1,3-butadiene and styrene.
Neoprene is a polymer of chloroprene.
Polystyrene is a polymer of styrene.

Answer: Buna-N

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