Question

Why aldehydes and ketones have lower boiling points than alcohols

Answer 1

Ciao,
alcohols contain -oH group unlike corbonyls thus they form hydrogen bonding in them so they have more boiling point than aldehydes and ketones .
it really hope that you will find it helpful

Answer 2

$\huge\textcolor{green}{\texttt{Answer :-}}$

Both alcohols and acids involve intermolecular hydrogen bonding. But no intermolecular H - bonding occur in aldehydes and ketones.

Therefore, attractive forces in aldehydes and ketones are lesser/weaker than acids and alcohols. Hence, lesser energy is required to break the attractive forces in aldehydes and ketones and thus they have low boiling points(low boiling point = less energy to break the attractive forces).