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

a.)Br2 experiences dipole0dipole interactions.

b.)ICl experiences dipole0dipole interactions.

c.)Br2 forms hydrogen bonds.

d.)ICl experiences induced dipole0induced dipole interactions.

Verified Answer :

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The best answer is B. ICl experiences induced dipole-induced dipole interactions. Both iodine and chlorine belongs to the same group of the periodic table. Electronegativity decreases as you go down a group therefore Cl will have a greater attraction with the bond it forms with another atom. Dipole-dipole interactions form between I and Cl. For the Br2 molecule, no dipole occurs because they are two identical atoms. Therefore we will be expecting ICl will have a higher boiling point due to higher binding energy it forms.

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