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Which of the following repeating-unit structures corresponds to neoprene polymer?

1. –CH2–C(Cl)=CH–CH2–
2. –CH2–CH(CN)–
3. –CH2–CH(Cl)–
4. –CH(C6H5)–CH2–

Correct answer: –CH2–C(Cl)=CH–CH2–

Solution

The correct option represents the repeating unit of neoprene, which is a synthetic rubber made from the polymerization of chloroprene. The structure includes a vinyl group and a chlorine atom, characteristic of neoprene's chemical composition.

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