A) \[{{\left( -C{{H}_{2}}-\underset{Cl\,\,\,\,\,}{\mathop{\underset{|\,\,\,\,\,\,\,\,}{\mathop{CH-}}\,}}\, \right)}_{n}}\]
B) \[{{\left( -C{{H}_{2}}-\underset{CN\,\,}{\mathop{\underset{|\,\,\,\,\,\,\,\,\,}{\mathop{CH-}}\,}}\, \right)}_{n}}\]
C) \[{{\left( -C{{H}_{2}}\underset{COOC{{H}_{3}}}{\overset{C{{H}_{3}}\,\,\,\,\,\,\,\,\,\,}{\mathop{\underset{\,|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}{\overset{|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}{\mathop{-C-\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}}}\,\,\,}}}\, \right)}_{n}}\]
D) \[{{\left( \underset{COO{{C}_{2}}{{H}_{5}}}{\mathop{\underset{|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}{\mathop{CH-\,\,\,\,\,\,\,\,\,\,\,\,}}\,}}\, \right)}_{n}}\]
Correct Answer: B
Solution :
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