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A compound containing one chlorine atom shows a peak at M and another at M plus 2 in a ratio of about

  • A.9 to 1
  • B.3 to 1
  • C.1 to 1
  • D.1 to 3

Answer: B

Correct answer: 3 to 1

Chlorine occurs as two isotopes in a natural ratio of about 3 to 1, chlorine-35 to chlorine-37, so a molecule containing one chlorine gives a peak at M and another two units higher at about a third the height. The pattern is diagnostic: seeing an M plus 2 peak at 33 per cent of M is strong evidence for a single chlorine.

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