Question

Why boiling point of aldehdes and ketones are lower than that of corresponding acids

Answer 1

The boiling points of aldehydes and ketones are higher than hydrocarbons and ethers of comparable molecular masses. ... Also, their boiling pointsare lower than those of alcohols of similar molecular masses due to absence of intermolecular hydrogen bonding.

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).