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The repeat unit of a condensation polymer weighs less than the monomers that formed it because

  • A.the chain loses its end groups as it grows longer
  • B.a small molecule is eliminated at each linkage
  • C.one of the monomers is consumed as a catalyst
  • D.some of the monomer is lost as unreacted residue

Answer: B

Water, methanol or hydrogen chloride splits out as each bond forms, so the polyester or polyamide repeat unit is lighter than the diacid and the diol or diamine taken together. In an addition polymer nothing is eliminated and the repeat unit matches the monomer exactly.

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