AIIMS 2017 Chemistry Boiling Points MCQ Question

Option A is correct because hydrogen fluoride (HF) exhibits strong hydrogen bonding due to the high electronegativity of fluorine, resulting in a higher boiling point compared to hydrogen chloride (HCl) and hydrogen bromide (HBr), which primarily exhibit van der Waals forces. In contrast, options B, C, and D incorrectly rank HCl and HBr relative to HF, failing to account for the significant impact of hydrogen bonding in HF, which elevates its boiling point above both HCl and HBr. Thus, the correct order based on boiling points is HF > HCl > HBr, reflecting the influence of intermolecular forces on physical properties.