A) \[{{H}_{2}}C=CH-CN\] and \[H C=CH-CH=C{{H}_{2}}\]
B) \[{{H}_{2}}C=CH-CN\] and \[{{H}_{2}}C=CH-C=C{{H}_{2}}\]
C) \[{{H}_{2}}C=CH-\underset{\begin{smallmatrix} | \\ Cl \end{smallmatrix}}{\mathop{C}}\,=CH\] and \[{{H}_{2}}C=CH-CH=C{{H}_{2}}\]
D) \[{{H}_{2}}C=CH-CH=C{{H}_{2}}\] and \[{{H}_{5}}{{C}_{6}}-CH=C{{H}_{2}}\]
Correct Answer: A
Solution :
Buna-N is a copolymer of butadiene and acrylonitrile \[\underset{1,3-butadiene}{\mathop{nC{{H}_{3}}=CH-CH=C{{H}_{2}}}}\,+\underset{Acrylonitrile}{\mathop{nC{{H}_{2}}=\overset{\begin{smallmatrix} CH \\ | \end{smallmatrix}}{\mathop{CH}}\,}}\,\xrightarrow[{}]{{}}\] \[\underset{Buna-N}{\mathop{-\left[ C{{H}_{2}}-CH=CH-C{{H}_{2}}-C{{H}_{2}}-\overset{\begin{smallmatrix} CH \\ | \end{smallmatrix}}{\mathop{CH}}\, \right]}}\,-\]
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