Which amongst the following molecules on polymerization produces neoprene?

Question

Accepted Answer

A. 1. Recall the monomer required to prepare **neoprene**.
Given that neoprene is the trade name for the polymer of **chloroprene (2-chloro-1,3-butadiene)**, the monomer must be a chlorinated diene.
$$
CH_2=CCl-CH=CH_2 \ 	ext{(chloroprene)}
$$

2. Compare this monomer structure with the given options.
Since **option A** depicts exactly this chloro-substituted butadiene structure, free radical addition polymerization of this monomer gives neoprene.
$$
n(CH_2=CCl-CH=CH_2) \xrightarrow{	ext{polymerization}} 	ext{Neoprene}
$$

3. Check why the remaining options are incorrect.
Option B is a vinylacetylene-type structure, option C is a different chlorinated compound, and option D is simple 1,3-butadiene (used for polybutadiene, not neoprene).

Hence, the answer is **A**.