The structure of Neoprene is :
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The Correct Option is A
Solution and Explanation
1,4-Addition of the diene leaves a double bond between C-2 and C-3, so the repeat unit is \(\mathrm{[-CH_2-C(Cl)=CH-CH_2-]_n}\), with Cl on the carbon of the double bond.
Option (1) shows exactly this unit. Option (2) is nitrile rubber (Buna-N, butadiene + acrylonitrile), option (3) is polyacrylonitrile, and option (4) is the melamine-formaldehyde polymer.
Answer: (1) the Cl-substituted polychloroprene unit \(\mathrm{[-CH_2-C(Cl)=CH-CH_2-]_n}\)
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