Question

Which of the following has the highest Boiling Point?

• A. Chloromethane
• B. Fluoromethane
• C. Bromomethane
• D. Iodomethane

Answer 1

Answer: (D)

Iodomethane

Answer 2

The correct option is (D): Iodomethane.
The boiling point of a compound is influenced by various factors, including the strength and nature of intermolecular forces. In this case, we can compare the compounds based on the polarity and strength of the halogen bonding.
Among the given compounds, the polarity and intermolecular forces increase in the order: Fluoromethane (B) < Chloromethane (A) < Bromomethane (C) < Iodomethane (D)
As we move down the halogen group, the size and polarizability of the halogen atoms increase. Larger halogen atoms induce stronger van der Waals forces, resulting in higher boiling points.
Therefore, Iodomethane (D) is expected to have the highest boiling point among the given compounds.