Question

Which of the following compounds shows strongest hydrogen bonding?

• A. $HF$
• B. $H_{2}O$
• C. $N{H}_3$
• D. $C{H}_{3}OH$

Answer 1

The correct option is A $HF$

Among the $F$, $O$ and $N$ , Fluorine has the higher value of electronegativity, this is the reason that fluorine can form the strongest hydrogen bond with the $H$ atom of another molecule.

Just take an idea from the value of energy of hydrogen bond that is formed with $HF$, $H_{2}O$ and $N{H}_3$

$HF$	$10kcal/mol$
$H_{2}O$	$7Kcal/mol$
$N{H}_3$	$2Kcal/mol$

means to break the hydrogen of one mole $HF$ molecules, $10Kcal$ energy is required.

So the correct option is [A].