Incorrect orders of boiling point is :

The boiling point $\mathrm{I}-\mathrm{Cl}<{\mathrm{Br}}_2$ is the incorrect order.

Because Iodine has a greater boiling point than bromine because it has more electrons than Br₂ and a larger relative molecular mass, which results in stronger van der Waals interactions between the molecules. Iodine has a greater boiling point than bromine because it takes more energy to break these molecules apart.

Hence, the option D is correct.