Question

Hydrogen fluoride is a liquid unlike other hydrogen halides because:

• A. $H-F$ bond is strong
• B. $F$ -atom is small in size
• C. hydrogen bonding is present
• D. $HF$ is a weak acid

Answer 1

Answer: (C)

hydrogen bonding is present

Hydrogen fluoride is a compound with the formula $HF$. This colourless gas or liquid is the principal industrial source of fluorine often in the aqueous form as hydrofluoric acid, and thus is the precursor to many important compounds including pharmaceuticals and polymers.Hydrogen fluoride boils near room temperature, while other hydrogen halides evaporate at much lower temperatures. Unlike other hydrogen halides, $HF$ is lighter than air and diffuses relatively quickly through porous substances due to the presence of hydrogen bonding.
Hence option $C$ is correct.