The attractive force which binds hydrogen atom of one molecule with electronegative atom (F,O or N) of another molecule is known as hydrogen bond or hydrogen bonding.
Hydrogen bonds are formed when hydrogen is bonded to strongly electronegative elements uch as F, O or N.
The size of electronegative atom should be small for formation of Hydrogen bonds. Hydrogen bonds are not formed by Cl because of its bigger size.
Example of Hydrogen bonds
Influence of Hydrogen bonding on properties
2. Higher melting and boiling points
3. Influence on the physical state