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Several common polymers are shown with their structural repeat units. Which of the following is mismatched or incorrectly written?

1. Neoprene; [—CH2—C(Cl)=CH—CH2—CH2—]n
2. Terylene; [—OC6H4COOCH2—CH2—O—]n
3. Nylon 66; [—NH(CH2)6NHCO(CH2)4CO—]n
4. Teflon; (—CF2—CF2—)n

Correct answer: Neoprene; [—CH2—C(Cl)=CH—CH2—CH2—]n

Solution

Neoprene (polychloroprene) has the repeat unit [-CH2-CCl=CH-CH2-]n (four carbons). The option writes an extra CH2 as [-CH2-C(Cl)=CH-CH2-CH2-]n, which is incorrect. Terylene, Nylon 66 and Teflon are written correctly.

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