Question:

Which one of the following structures represents the neoprene polymer ?

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Neoprene is the addition polymer of chloroprene (2-chlorobuta-1,3-diene).
Updated On: Nov 11, 2026
  • \(\left[\mathrm{CH_2-C(Cl)=CH-CH_2}\right]_n\)
  • \(\left[\mathrm{CH_2-CH(CN)}\right]_n\)
  • \(\left[\mathrm{CH_2-CH(Cl)}\right]_n\)
  • \(\left[\mathrm{CH(C_6H_5)-CH_2}\right]_n\)
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The Correct Option is A

Solution and Explanation

Neoprene is obtained by free-radical polymerisation of chloroprene, CH2=C(Cl)-CH=CH2. The 1,4-addition leaves a double bond between C-2 and C-3 of each unit, so the repeating unit is -[CH2-C(Cl)=CH-CH2]-n.
Option (2) is polyacrylonitrile (from CH2=CHCN), (3) is polyvinyl chloride (from CH2=CHCl), and (4) is polystyrene (from CH2=CHC6H5).
Answer: (1) -[CH2-C(Cl)=CH-CH2]n-
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