
Which of the following best represents the relationship among the boiling points in FBr, argon, and Cl2?

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Correct Answer: D. Ar < Cl2 < FBr
The order of boiling points corresponds to the strength of intermolecular forces. Argon has the weakest intermolecular forces: as a neutral atom, it is less polarizable than the larger Cl2. The latter has no dipole moment, so it exerts weaker forces than FBr.
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