34. The formula of neoprene, one of the synthesis rubber families, is

 

What is the name of the monomer used to produce neoprene in industry?
(A) 2-chloro-1-butene
(B) 2-chloro-2-butyne
(C) 1,2-dichloro-1-butene
(D) 2-chloro-1,3-butadiene
(E) ethyne and chloroethene 

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