Question

molucular size of ICI and br2 is nearly same, but boiling point of ici about 40c higher than br2 the might be due to

Answer 1

It’s pretty close to the same molecular weight (162 vs. 160), but it’s polar: because iodine and chlorine have different electronegativies, the ICl molecule has a permanent dipole. Molecules composed of identical atoms do not. That means that ICl molecules are attracted to each other by dipole-dipole interactions as well as London dispersion forces, whereas Br₂ molecules are attracted to each other only by London dispersion forces. Dipole-dipole interactions are stronger, so it takes more energy to separate the molecules, so the boiling point is higher

Answer 2

Answer:

ICl is polar covalent molecular while Br2 is non polar