Question

Ethyl alcohol and propane have nearly equal molecular weights. But, the former is a liquid with high boiling point and the latter is a gas with low boiling point. Give reason.

Answer 1

Alcohols have higher boiling points than alkanes of same molecules mass because alcohols $(-OH)$ have hydroxyl groups which involve in hydrogen bonding.As the intermolecular forces are relatively high in hydrogen bonding,ethylalcohol has higher boiling point than propane.