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Condensation polymerisation requires monomers that are

  • A.identical to one another in structure
  • B.free of any oxygen or nitrogen atoms
  • C.at least bifunctional in reactive groups
  • D.unsaturated at one carbon-carbon bond

Answer: C

Two reactive groups per molecule are the minimum for a chain to grow at both ends, as in a diacid with a diamine. A monofunctional molecule stops the chain, which is how the molecular mass is deliberately controlled in practice.

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