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Which of the following classes contain exactly 4 structural isomers?

  1. AAlkyl groups
  2. BPrimary amines
  3. CAldehydes (saturated, open chain)
  4. DKetones (saturated, open chain)

Answer: A, B, C

C4H9 groups: n-butyl, sec-butyl, isobutyl, tert-butyl = 4. Primary amines C4H11N = 4. Aldehydes C5H10O = 4 (pentanal, 2-methylbutanal, 3-methylbutanal, 2,2-dimethylpropanal). Ketones C5H10O = 3 (pentan-2-one, pentan-3-one, 3-methylbutan-2-one). Correct: A, B, C.
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