Which is the monomer of Neoprene in the following?

2 2013 NEET PolymersSynthetic Rubbers Easy
Which is the monomer of Neoprene in the following?
A $CH_2=CH-C\equiv CH$
B $CH_2=CH-CH=CH_2$
C $CH_2=C(CH_3)-CH=CH_2$
D $CH_2=C(Cl)-CH=CH_2$

Detailed Solution

$n\,CH_2=C(Cl)-CH=CH_2$ (chloroprene) $\xrightarrow{\text{polymerisation}} \left[-CH_2-C(Cl)=CH-CH_2-\right]_n$ (neoprene, artificial rubber)

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