Molecular sizes of I C l and B r 2 are nearly same but boiling point of I C l is about 40 o C higher than B r 2 . Because.

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Br - Br is a non - polar whereas I - Cl is a polar bond because of electronegativity difference between I and Cl. Polarity in the bond increases the bond - energy and thus the boiling point.

$B r_{2} μ = 0; I C l μ \neq 0$

Strong intermolecular force of attractions amongst ICl molecules

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