C₃H₆O can be:
A) An alcohol, but neither an aldehyde nor a ketone
B) An alcohol, an aldehyde, or a ketone
C) An alcohol or an aldehyde, but not a ketone
D) An alcohol or a ketone, but not an aldehyde
E) An aldehyde or a ketone, but not an alcohol
IMAT 2026 · Question 45
Q45 - Isomerism
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The correct answer is B) An alcohol, an aldehyde, or a ketone.
A saturated compound with 3 carbons would have 8 H (C₃H₈O). C₃H₆O has 2 H fewer, so it has one degree of unsaturation: one double bond or one ring. That allows all three:
Aldehyde: propanal, CH₃CH₂CHO
Ketone: propanone (acetone), CH₃COCH₃
Alcohol: prop-2-en-1-ol, CH₂=CHCH₂OH, or cyclopropanol
Options A, C, D and E each rule out one of these, but all three really exist with this formula.
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