ICl has a higher boiling point than Br2. What is the best explanation for this?

ICl contains two different atoms, so its bond is polar and the molecule has a permanent dipole. ICl molecules therefore attract one another through dipole-dipole interactions, in addition to dispersion forces. Br₂ is nonpolar and has no permanent dipole, so it does not experience dipole-dipole interactions. The added attraction in ICl helps explain its higher boiling point, making “ICl experiences dipole-dipole interactions” the best choice.

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