Which compound exhibits the highest normal boiling point due to intermolecular hydrogen bonding?
Answer and explanation
Correct answer: D. Water (H2O)
Water (H2O) has an unusually high boiling point (100 °C) because each molecule can form an extensive three-dimensional tetrahedral network of four hydrogen bonds (two hydrogen bond donors via its H atoms and two acceptors via the oxygen lone pairs). Methane possesses only weak London dispersion forces, and H2S and PH3 lack sufficiently electronegative atoms (N, O, F) to form hydrogen bonds.
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