Arrange the following compounds in order of in increasing boiling poi…

The correct answer is Option (4) → (C), (A), (D), (B)

Boiling point increases with increase in molecular mass and intermolecular van der Waals forces. Heavier halogen atoms lead to stronger intermolecular attractions and therefore higher boiling points.

Reasoning:

• $(C)$ Chloromethane ($CH_{3}Cl$): Lowest molecular mass, weakest intermolecular forces, lowest boiling point.
• $(A)$ Bromomethane ($CH_{3}Br$): Higher mass than chloromethane, so boiling point increases.
• $(D)$ Dibromomethane ($CH_{2}Br_{2}$): Two bromine atoms, much higher mass and stronger attractions.
• $(B)$ Bromoform ($CHBr_{3}$): Three bromine atoms, highest molecular mass and strongest intermolecular forces, so highest boiling point.