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What is the fingerprint region used for?

  • A.Measuring the sample's path length
  • B.Establishing the degree of conjugation
  • C.Confirming a compound's identity against a reference
  • D.Identifying which functional groups are present

Answer: C

Below about 1500 reciprocal centimetres the bands arise from skeletal and bending modes involving the whole molecule, so the pattern is complex and highly specific but hard to assign band by band. Functional groups are read above it. A region that is uninterpretable in detail but unique as a whole is exactly what an identification by comparison needs.

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