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Topic: Functional groups, homologous series, classification· Some Basic Principles of Organic Chemistry

Which statement regarding polymers is not correct ?

1. Thermosetting polymers are reusable.

2. Elastomers have polymer chains held together by weak intermolecular forces.

3. Fibers possess high tensile strength.

4. Thermoplastic polymers are capable of repeatedly softening and hardening on heating and cooling respectively.

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Answer: 1. Thermosetting polymers are reusable.

Key idea: thermosetting polymers are cross-linked and cannot be remoulded.

Thermosetting polymers (bakelite, melamine) set permanently on heating because of extensive cross-linking. They cannot be softened again, so they are not reusable. Statement (1) is therefore the incorrect one.

  • (2) Elastomers have weak forces between coiled chains, so they stretch and return (rubber).
  • (3) Fibres have strong H-bonding or dipole forces, giving high tensile strength (nylon-6,6).
  • (4) Thermoplastics soften on heating and harden on cooling repeatedly (polythene).
Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report
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