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Question
Arrange the set of compounds in order of increasing boiling points.
Bromomethane, Bromoform, Chloromethane, Dibromomethane.
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Solution
The strength of the intermolecular interactions in organic molecules determines their boiling points. These forces consist of van der Waals forces and dipole-dipole interactions and depend on the molecular mass and surface area of the molecules. Compounds with higher molecular mass have higher boiling points. Thus, the correct order is:
Chloromethane < Bromomethane < Dibromomethane < Bromoform
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