Question

Why propanol has higher boiling point than butanol?

Answer 1

Because it has more intermolecular force of attraction.

Answer 2

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

The molecule of propanol are held together by intermolecular hydrogen bonding while butane molecules have only weak van der Waals forces of attraction.

Since hydrogen bonds are stronger than van der Waals force, therefore, propanol has higher boiling point than butane.