Ncert Exercises & Solutions

In which of the following compounds, the hydrogen bonding is strongest?

1. HCl

2. H₂O

3. HI

4. H₂S

HINT: Hydrogen bonding occur when hydrogen is attached to oxygen, fluorine, and nitrogen.

Explanation:

STEP 1:

There are two requirements for hydrogen bonding.

1. Molecules has hydrogen attached to a highly electronegative atom (N,O,F).

2. Molecule has a lone pair of electrons on a small highly electronegative atom (N,O,F).

STEP 2:

HCl, HI and H₂S do not form H-bonds. Only H₂O forms hydrogen bonds. One H₂O molecule forms four H-bonding.