Molecular size of `ICI` and `Br_2` is nearly same but `b.pt.` of ` ICI` is about ` 40^@` higher than `BR_2` . This is due to :

Options

A. `ICl` is bigger than `Br_2`
B. `I-Cl` is bond is stronger than `Br-Br` bond
C. `ICl` is polar while `Br_2` is nonpolar
D. `IE` of `BrgtIE` of I

Answer

C

Explanation

Since `ICl` (heteronuclear diatomic molecule) is polar while `Br_2` (homonuclear diatomic) is nonpolar, the molecules of `ICl` are held together by dipole-dipole interactions while `Br_2` molecules are held together by weak dispersion forces. Note that during the process of boiling, we only overcome intermolecular attractions, we never break the covalent bonds between the atoms in a molecule. Thus option (2) cannot be correct.