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A proton spectrum shows a triplet and a quartet with integrated areas in the ratio 3 to 2. The fragment present is

  • A.a tert-butyl group
  • B.an ethyl group
  • C.a methyl group alone
  • D.an isopropyl group

Answer: B

Three protons split by two neighbours give the triplet and two protons split by three give the quartet, which is the signature of a chain ending in a methyl next to a methylene. An isopropyl group would give a doublet and a septet instead.

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