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(a) Nylon-6: monomer is caprolactam (ε-caprolactam), a seven-membered cyclic amide. [Structure: a ring of five CH2 groups, one C=O and one NH, i.e. –CH2–CH2–CH2–CH2–CH2–C(=O)–NH– closed into a ring.] On ring-opening polymerisation it gives –[NH–(CH2)5–CO]n–.

(b) Natural rubber: monomer is isoprene (2-methylbuta-1,3-diene): CH2=C(CH3)–CH=CH2. Natural rubber is cis-1,4-polyisoprene.

Doubtly AI · 29 Oct 2026 AI-generated · not yet verified Report
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