Help with Intermolecular Forces - GRE Subject Test: Biochemistry, Cell, and Molecular Biology

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Question

Which of the following forces is strongest between molecules of hydrochloric acid (HCl)?

Answer

Since hydrochloric acid has a partial positive charge on the hydrogen and a partial negative charge on the chlorine, the molecules will have dipole-dipole interactions between them. Although hydrogen bonding is a stronger force, a hydrogen must be attached to a nitrogen, oxygen, or fluorine in order to exhibit hydrogen bonding.

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Question

Which of the following molecules is not capable of hydrogen bonding?

Answer

Hydrogen bonding is possible when a hydrogen atom is attached to a nitrogen, oxygen, or fluorine. Of the following options, hydrochloric acid is the only option that does not fit the criteria.

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