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Which of the following hydrogen bonds is the strongest?

1. O – H......F
2. F – H......F
3. O – H......O
4. O – H......F

Correct answer: F – H......F

Solution

Hydrogen-bond strength rises with the electronegativity of the atoms involved, and fluorine is the most electronegative element. Therefore F-H...F is the strongest hydrogen bond, stronger than any O-H...O or O-H...F bond.

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