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Question

CHCHCu2Cl2/NH4Cl−−−−−−−−ΔAHClB
When B is polymerized, what is not true about the polymer?

A
Polymer formed is 1,4-addition polymer
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B
Polymer formed is known as polyisoprene
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C
Polymer formed is known as synthetic rubber
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D
Polymer formed is poly-2-chlorobuta-1,3-diene
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Solution

The correct option is B Polymer formed is known as polyisoprene
CHCHCu2Cl2/NH4Cl−−−−−−−−ΔCH2=CHCCH(A)HClH2C=CHC|Cl=CH2(B)
Acetylene dimerises to give vinyl acetylene, which is then combined with HCl to afford 4-chloro-1,2-butadiene (B), which in the presence of copper(I) chloride, rearranges to the targeted 2-chlorobuta-1,3-diene.
Polymerisation of B (chloroprene) yields neoprene, a synthetic rubber which is formed by 1,4-addition.

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