A) \[-(C{{H}_{2}}-)\underset{\begin{smallmatrix} | \\ Cl \end{smallmatrix}}{\mathop{C}}\,=CH-C{{H}_{2}}){{-}_{n}}\]
B) \[-(C{{H}_{2}}-\underset{{}}{\overset{\begin{smallmatrix} CN \\ | \end{smallmatrix}}{\mathop{C}}}\,H){{-}_{n}}\]
C) \[-(C{{H}_{2}}-\underset{{}}{\overset{\begin{smallmatrix} CN \\ | \end{smallmatrix}}{\mathop{C}}}\,H){{-}_{n}}\]
D) \[-(\underset{\begin{smallmatrix} | \\ {{C}_{6}}{{H}_{5}} \end{smallmatrix}}{\mathop{CH}}\,-C{{H}_{2}}){{-}_{n}}\]
Correct Answer: A
Solution :
Neoprene (synthetic rubber) is a polymer of chloroprene (i.e., 2-chloro-1, 3-butadiene). \[\underset{\begin{smallmatrix} 2-chloro-1,3-butadience \\ \,\,\,\,\,\,\,\,\,\,\,\,\,(chloroprene) \end{smallmatrix}}{\mathop{n\,{{H}_{2}}C=\underset{\begin{smallmatrix} | \\ Cl \end{smallmatrix}}{\mathop{C}}\,-\underset{\begin{smallmatrix} | \\ H \end{smallmatrix}}{\mathop{C}}\,=C{{H}_{2}}}}\,\xrightarrow[{}]{Polymerisation}\] \[\underset{\begin{smallmatrix} \,\,\,\,\,\,\,\,\,\,\,\,\,\,neoprene \\ (synthertic\,rubber) \end{smallmatrix}}{\mathop{-\left[ C{{H}_{2}}-\underset{\begin{smallmatrix} | \\ Cl \end{smallmatrix}}{\mathop{C}}\,=\underset{\begin{smallmatrix} | \\ H \end{smallmatrix}}{\mathop{C}}\,-C{{H}_{2}} \right]{{-}_{n}}}}\,\]
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