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Which compound or pair of compounds is employed in the production of nylon 6?

1. C6H5—CH=CH2
2. HOOC(CH2)4COOH + NH2(CH2)6NH2
3. CH2=CH—C(CH3)=CH2
4. Cyclohexanone

Correct answer: Cyclohexanone

Solution

Nylon-6 is made by ring-opening polymerization of caprolactam, which is prepared from cyclohexanone (via its oxime and Beckmann rearrangement). Among the choices, cyclohexanone is the relevant starting material. Styrene gives polystyrene, and the adipic acid + hexamethylenediamine pair gives Nylon-6,6.

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