The compound with the lowest boiling point among the following is: HF, HCl, HI, HBr

The boiling point of covalent compounds(HF, HCl, HBr, HI) increases with an increase in their molecular weight due to increase in Van Der Waal’s forces of attraction among molecules.
HF shows H-bonding possess higher boiling point or less volatile nature. HCl has the least boiling point due to the small dispersion intermolecular forces.
HCl < HBr < HI < HF.

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