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Why do aldehydes boil lower than comparable alcohols?
AThey have lower molecular mass
BThey lack intermolecular H-bonding
CThey have no dipole-dipole forces
DThey are ionic in character
Answer & Solution
Correct answer: B. They lack intermolecular H-bonding
The carbonyl compound has no O-H bond to donate hydrogen bonds, so only weaker dipole-dipole attraction holds its molecules together.
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