Buna-N synthetic rubber is a copolymer of:

H_{2} C = C H - C H = C H_{2}

and

H_{2} C = C H - C H = C H_{2}

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H_{2} C = C H - C H = C H_{2}

and

H_{5} C_{6} - C H = C H_{2}

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H_{2} C = C H - C N

and

H_{2} C = C H - C H = C H_{2}

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H_{2} C = C H - C N

and

H_{2} C = C H - C (C H_{3}) = C H_{2}

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Solution

The correct option is C $H_{2} C = C H - C N$ and $H_{2} C = C H - C H = C H_{2}$

Buna - N is a copolymer of acrylonitrile ( $H_{2} C$ = $C H$ – $C N$ ) and buta- $1, 3$ -diene( $H_{2} C$ = $C H$ – $C H$ = $C H_{2}$ ).

Hence, the correct option is C.

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