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Which of the following sets contain only compounds that are structural isomers of one another?

  1. AButan-1-ol, butan-2-ol and ethoxyethane
  2. BPropanal, propanone and prop-2-en-1-ol
  3. CMethyl ethanoate, ethyl methanoate and ethanoic acid
  4. DNitroethane, ethyl nitrite and glycine (aminoethanoic acid)

Answer: A, B, D

Compare molecular formulas. Butanol isomers and ethoxyethane: all C4H10O. Propanal, propanone, allyl alcohol: all C3H6O. Methyl ethanoate and ethyl methanoate are C3H6O2 but ethanoic acid is C2H4O2. Nitroethane, ethyl nitrite and glycine are all C2H5NO2. Correct: A, B, D.
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