The answer is: a. The intermolecular forces are much greater in water than in hydrogen sulfide and hydrogen selenide. Boiling point increases with strength of intermolecular forces as these intermolecular bonds need to be broken for the molecules to escape into the gas phase. Water has strong intermolecular hydrogen bonds not present in hydrogen sulfide and hydrogen selenide. Thus water has a much higher boiling point. Solution The answer is: a. The intermolecular forces are much greater in water than in hydrogen sulfide and hydrogen selenide. Boiling point increases with strength of intermolecular forces as these intermolecular bonds need to be broken for the molecules to escape into the gas phase. Water has strong intermolecular hydrogen bonds not present in hydrogen sulfide and hydrogen selenide. Thus water has a much higher boiling point..