Question

Which of the following is not correctly matched with respect to the intermolecular forces existing amongst the molecules?

• A. Benzene: London dispersion forces
• B. $H_{3}P{O}_4$: London dispersion force, hydrogen bonding
• C. $HCl$: London dispersion force, dipole- dipole attraction
• D. $ICl$: London dipersion force, Hydrogen bonding

Answer 1

The correct option is D $ICl$: London dipersion force, Hydrogen bonding

All molecules have London dispersion force because of polarizable electron cloud.
Non polar molecules have only London dispersion force. Benzene is a non polar molecule, so it has only London dispersion force.
Polar moleucles have dipole - dipole attraction in addition to London dispersion force. As HCl is a polar molecule, so it has dipole-dipole attraction.
Molecules with, $O-H$, $N-H$, or $F-H$ bond have hydrogen bonding in addition to London dipersion forces. Therefore, Orthophosphoric acid has hydrogen bonding.
Molecule $ICl$ is polar, so addition to London dispersion force it has dipole - dipole attraction also.