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Consider the following statements about Nylon-6 and its monomer: (P) Nylon-6 is formed by ring-opening polymerisation of caprolactam. (Q) Caprolactam is a seven-membered cyclic amide. (R) The repeat unit of Nylon-6 is identical to that of Nylon-6,6. (S) The polymerisation of caprolactam is a classical addition polymerisation. Which combination of statements is CORRECT?

1. P and Q only
2. P, Q and S only
3. P only
4. Q and R only

Correct answer: P and Q only

Solution

P is TRUE: Nylon-6 is synthesised by ring-opening polymerisation of caprolactam. Q is TRUE: caprolactam is a 7-membered ring (6 CH2 groups + 1 NH-C=O unit). R is FALSE: Nylon-6 repeat unit is -[NH-(CH2)5-CO]- whereas Nylon-6,6 is -[NH-(CH2)6-NH-CO-(CH2)4-CO]- — these are structurally distinct. S is FALSE: ring-opening of a lactam proceeds by nucleophilic acyl substitution, not classical addition polymerisation.

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