Answer
Hydrogen flouride has intermolecular bonding of hydrogen. Hydrogen chloride has intermolecular bonding of van der Waals. Since hydrogen bond is stronger than van der Waals, more energy will be required to break this bond. Thus the higher boiling temperature.
Work Step by Step
Hydrogen flouride has intermolecular bonding of hydrogen. Hydrogen chloride has intermolecular bonding of van der Waals. Since hydrogen bond is stronger than van der Waals, more energy will be required to break this bond. Thus the higher boiling temperature.