A) \[C{{H}_{2}}=CH-C\equiv CH\]
B) \[C{{H}_{2}}=\underset{\begin{smallmatrix} | \\ C{{H}_{3}} \end{smallmatrix}}{\mathop{C}}\,-CH=C{{H}_{2}}\]
C) \[C{{H}_{2}}=\underset{\begin{smallmatrix} | \\ Cl \end{smallmatrix}}{\mathop{C}}\,-CH=C{{H}_{2}}\]
D) \[C{{H}_{2}}=CH-CH=C{{H}_{2}}\]
Correct Answer: C
Solution :
Neoprene is synthetic rubber and is a polymer of chloroprene which is chemically 2-chlorobuta-1, 3-diene. \[\underset{\text{Chloroprene}}{\mathop{\text{nC}{{\text{H}}_{\text{2}}}\text{=}\underset{\begin{smallmatrix} \text{ }\!\!|\!\!\text{ } \\ \text{Cl} \end{smallmatrix}}{\mathop{\text{C}}}\,-\text{CH}\,\text{=}\,\text{C}{{\text{H}}_{\text{2}}}}}\,\xrightarrow[{}]{{}}\underset{\text{Neoprene}}{\mathop{-{{\left[ \text{C}{{\text{H}}_{\text{2}}}-\underset{\begin{smallmatrix} | \\ \text{Cl} \end{smallmatrix}}{\mathop{\text{C}}}\,=\text{CH}-\text{C}{{\text{H}}_{\text{2}}} \right]}_{n}}}}\,-\]
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