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Which of the following pairs are structural isomers of each other?

AButan-2-ol and ethoxyethane
BPropanone and propan-2-ol
CMethyl ethanoate and propanoic acid
DEthanamide and ethanoic acid

Answer: A, C

Compare molecular formulas: butan-2-ol and ethoxyethane are both

C X_{4} H X_{10} O

; propanone is

C X_{3} H X_{6} O

while propan-2-ol is

C X_{3} H X_{8} O

; methyl ethanoate and propanoic acid are both

C X_{3} H X_{6} O X_{2}

; ethanamide is

C X_{2} H X_{5} NO

and ethanoic acid

C X_{2} H X_{4} O X_{2}

. Isomeric pairs: A, C.

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