Question

Boiling point of hydrogen fluoride is highest amongst $HF$, $HCl$, $HBr$ and $HI$. Which type of intermolecular forces are present in hydrogen fluoride?

• A. $H— F$ has highest van der Waals forces and dipole moment.
• B. $H — F$ has highest London forces.
• C. $H— F$ has highest dipole moment hence has dipole-dipole, London forces and hydrogen bonding.
• D. $H— F$ has strong intermolecular interactions like dipole-induced dipole.

Answer 1

Answer: (C)

$H— F$ has dipole-dipole interaction, London forces and hydrogen bonding due to highest electronegativity of $F$. Hence, boiling point of $H— F$ is highest.