Which is true about Buna-N?

We need to identify the correct statement about Buna-N.

Understand what Buna-N is.

Buna-N is a synthetic rubber. Let us break down the name:

- Bu stands for butadiene (1,3-butadiene)

- Na stands for sodium (Na), which is used as a catalyst/initiator in polymerization

- N stands for nitrile (acrylonitrile, $$CH_2=CH-CN$$)

Evaluate each option.

Option A: "It is a linear polymer of 1,3-butadiene." — This is incorrect. A linear polymer of only 1,3-butadiene would be Buna rubber, not Buna-N. Buna-N is a copolymer.

Option B: "It is obtained by copolymerization of 1,3-butadiene and styrene." — This is incorrect. The copolymer of 1,3-butadiene and styrene is called Buna-S (where S stands for styrene), not Buna-N.

Option C: "It is obtained by copolymerization of 1,3-butadiene and acrylonitrile." — This is correct. Buna-N is obtained by the copolymerization of 1,3-butadiene ($$CH_2=CH-CH=CH_2$$) and acrylonitrile ($$CH_2=CH-CN$$).

Option D: "The suffix N in Buna-N stands for its natural occurrence." — This is incorrect. The N stands for nitrile (acrylonitrile), not natural. Buna-N is a synthetic rubber.

The correct answer is Option C.