A) \[C{{H}_{2}}=CH-CH=C{{H}_{2}}\]and \[{{H}_{5}}{{C}_{6}}-CH=C{{H}_{2}}\]
B) \[C{{H}_{2}}=CH-CN\]and \[{{H}_{2}}C=CH-CH=C{{H}_{2}}\]
C) \[{{H}_{2}}C=CH-CN\]and \[C{{H}_{2}}=CH-C(C{{H}_{3}})=C{{H}_{2}}\]
D) \[{{H}_{2}}C=CH-C(Cl)=C{{H}_{2}}\]and \[{{H}_{2}}C=CH-CH=C{{H}_{2}}\]
Correct Answer: B
Solution :
Buna-N is obtained by copolymerisation of 1, 3-butadiene and acrylonitrile in the presence of a peroxide catalyst. \[\underset{1,3-butadiene}{\mathop{nC{{H}_{2}}=CH-CH=C{{H}_{2}}}}\,+\underset{Acrylonitrile}{\mathop{nC{{H}_{2}}=\overset{\begin{smallmatrix} CN \\ | \end{smallmatrix}}{\mathop{CH}}\,}}\,\]\[\xrightarrow[{}]{Copolymerisation}\]\[\underset{Buta-N}{\mathop{-\left[ C{{H}_{2}}-CH=CH-C{{H}_{2}}-C{{H}_{2}}-\overset{\begin{smallmatrix} CN \\ | \end{smallmatrix}}{\mathop{CH}}\, \right]-}}\,\]
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