A) \[{{\left( \underset{\begin{smallmatrix} | \\ CN \end{smallmatrix}}{\mathop{-C{{H}_{2}}-CH-}}\, \right)}_{n}}\]
B) \[{{\left( -C{{H}_{2}}-\underset{\begin{smallmatrix} | \\ COOC{{H}_{3}} \end{smallmatrix}}{\overset{\begin{smallmatrix} C{{H}_{3}} \\ | \end{smallmatrix}}{\mathop{C}}}\,- \right)}_{n}}\]
C) \[{{\left( -C{{H}_{2}}-\underset{\begin{smallmatrix} | \\ COO{{C}_{2}}{{H}_{5}} \end{smallmatrix}}{\mathop{CH-}}\, \right)}_{n}}\]
D) \[{{\left( \overset{\begin{smallmatrix} -C{{H}_{2}}-CH- \\ | \end{smallmatrix}}{\mathop{Cl}}\, \right)}_{n}}\]
Correct Answer: A
Solution :
Poly acrylonitrile or acrilan is a hard horny and a high melting material \[nC{{H}_{2}}=\underset{Acrylonitrile}{\mathop{\underset{\begin{smallmatrix} | \\ CN \end{smallmatrix}}{\mathop{CH}}\,}}\,\xrightarrow[{}]{Polymerizaton}{{\underset{\begin{smallmatrix} Polyacrylonitrile \\ \,\,\,\,\,\,\,\,\,\,\,\,\,\,(PAN) \end{smallmatrix}}{\mathop{-\left( \underset{\begin{smallmatrix} | \\ CN \end{smallmatrix}}{\mathop{C{{H}_{2}}-CH}}\, \right)-}}\,}_{n}}\]
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