Question

Between ICl and Br_2 which of the following would have the higher boiling point?

A. ICl
B. B_2
C. Both will have the same boiling point.
D. It cannot be determined from the information given.

Answer 1

ICl has the higher boiling point compared to Br₂ because it is polar with dipole-dipole interactions, in addition to London dispersion forces, whereas Br₂ is nonpolar and only has London dispersion forces. The correct option is (B).

Step-by-step explanation:

The compound ICl, iodine monochloride, and Br₂, bromine, have similar molecular weights and thus comparable London dispersion forces.

However, the key difference between the two is that ICl is a polar molecule, which means it has dipole-dipole interactions in addition to London dispersion forces. Conversely, Br₂ is nonpolar and lacks dipole-dipole interactions.

Due to the stronger intermolecular forces from both London dispersion and dipole-dipole attractions, ICl will have a higher boiling point than Br₂.