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. \[\underset{1,3-\text{butadiene}}{\mathop{nC{{H}_{2}}=CH-CH=C{{H}_{2}}}}\,+\underset{\text{Acrylonitrile}}{\mathop{nC{{H}_{2}}=\overset{CN}{\mathop{\overset{|}{\mathop{CH}}\,}}\,}}\,\] \[\xrightarrow{\text{Coppolymerisation}}\]\[{{\left[ \_\_C{{H}_{2}}-CH=CH-C{{H}_{2}}-C{{H}_{2}}-\overset{CN}{\mathop{\overset{|}{\mathop{CH}}\,}}\,\_\_ \right]}_{n}}\]
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