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Answer: (2) Teflon

Teflon (polytetrafluoroethene) is made by addition (chain-growth) polymerisation of tetrafluoroethene, with no loss of small molecules:

\[\mathrm{n\,CF_2{=}CF_2 \rightarrow {-}(CF_2{-}CF_2)_n{-}}\]

The others are condensation polymers, formed with loss of water or similar molecules:

  • Dacron: ethylene glycol + terephthalic acid.
  • Nylon-6,6: hexamethylenediamine + adipic acid.
  • Novolac: phenol + formaldehyde.
Doubtly AI · 23 Oct 2026 AI-verified · Oct 2026 Report
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