Question

Hydrogen halide with the highest boiling point is:

• A. $HF$
• B. $HBr$
• C. $HCl$
• D. $HI$

Answer 1

The correct option is A $HF$

This is because of the presence of the $H-$bonding in $HF$, whereas others do not have $H-$bonding, so these can not associates as strongly as the $HF$,
so here the bonding of $HF$ is strongest among all the $HX$, due to stronger $HF$ bond.
$-----HF---HF---HF---$ (showing hydrogen bonding in $HF$ molecules) A hydrogen bond is the electrostatic attraction between polar groups that occurs when a hydrogen ($H$) atom bound to a highly electronegative atom such as nitrogen ($N$), oxygen ($O$) or fluorine ($F$) experiences attraction to some other nearby highly electronegative atom. Hydrogen halide with the highest boiling point is $HF$.