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What does a Kendrick mass plot help identify?

  • A.Series of compounds differing by a methylene group
  • B.The charge state of a multiply charged ion
  • C.The resolution the instrument achieved
  • D.Isotope patterns in halogenated compounds

Answer: A

Rescaling the mass axis so that a methylene group weighs exactly fourteen makes every member of a homologous series fall on a horizontal line, which reveals families in a complex mixture at a glance. Charge state, resolution and isotope patterns are read other ways. Choosing a coordinate system in which the structure of interest becomes a straight line is the same idea that makes Bode plots useful. Framing the question as which quantity the change acts upon makes the answer follow without calculation.

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