Question

Boiling point of alcohol is comparatively higher than that corresponding alkane due to:

Answer 1

Correct option is A. Intermolecular hydrogen bonding
In alkanes, the only intermolecular forces are Van der Waals dispersion forces.

Due to high electro-negativity of oxygen in alcohols, inter molecular hydrogen bond is possible. Hydrogen bonds are much stronger than Van der Waals and therefore it takes more energy to separate alcohol molecules than it does to separate alkane molecules. So due to strong inter molecular H-bonds in alcohols, they have higher boiling points than ethers.

Hence, option $$A$$ is correct.