Question

Why fluoride has more boiling point than hydrogen chloride?

Answer 1

Fluorine has the highest electronegativity of any atom. That means it likes to pull electrons toward it. When fluorine bonds with hydrogen, the polarity is so strong that it begins to exhibit the property of hydrogen bonding, which is in essence just an extreme dipole. Chlorine simply doesn’t have the pull of its halogen counterpart and can’t form that polar of a molecule.