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Which is true about Buna-N?

1. It is a linear polymer of 1, 3-butadiene
2. It is obtained by copolymerization of 1, 3- butadiene and styrene
3. It is obtained by copolymerization of 1, 3- butadiene and acrylonitrile
4. The suffix N in Buna-N stands for its natural occurrence.

Correct answer: It is obtained by copolymerization of 1, 3- butadiene and acrylonitrile

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