Buna–N synthetic rubber is a copolymer of :-
$\mathrm{H}_{2} \mathrm{C}=\mathrm{CH}-\mathrm{CN}$ and $\mathrm{H}_{2} \mathrm{C}=\mathrm{CH}-\mathrm{CH}=\mathrm{CH}_{2}$
$\mathrm{H}_{2} \mathrm{C}=\mathrm{CH}-\mathrm{CH}=\mathrm{CH}_{2}$ and $\mathrm{H}_{5} \mathrm{C}_{6}-\mathrm{CH}=\mathrm{CH}_{2}$
Correct Option: 1
Buna- $\mathrm{N}$ is actually abbrebiated form, where Bu represents 1,3 -butadiene, Na represents sodium and $\mathrm{N}$ represents nitrile (acrylonitrile).
Thus, Buna-N is a copolymer of 1,3 -butadiene and acrylonitrile usually copolymer of 1,3 -butadiene, and acrylonitrile usually ploymerise in the presence of sodium.
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