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JEE Main levelSingle correct optionDifficulty 2 of 3ph066

$ICl$ (boiling point about 370 K) and $Br X_{2}$ (about 332 K) have almost the same molar mass. The higher boiling point of $ICl$ is best explained by

Ahydrogen bonding between $ICl$ molecules
Bionic bonding between $I X^{+}$ and $Cl X^{-}$ in the liquid
Cdipole-dipole attraction between polar $ICl$ molecules in addition to dispersion forces
Dthe need to break the covalent I-Cl bond on boiling

Answer: C

Molar masses are similar, so dispersion forces are comparable.

ICl

is polar (Cl more electronegative), so extra dipole-dipole forces raise its boiling point, while

Br X_{2}

is non-polar. Boiling does not break covalent bonds and

ICl

has no H-bonding.

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