The boiling points of the halogens increase in the order f2 < cl2 < br2 < i2 due to the resulting increasing interactions. a. ion-dipole b. hydrogen-bonding c. ion-ion d. dispersion forces e. permanent dipole-dipole

Answer is D, dispersion forces.

Explanation:

Dispersion forces are weak inter-molecular forces based on the creation of temporary dipoles in neutral molecules. They are regarded as the weakest inter-molecular forces.

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