Hydrogen bonding is the electrostatic force of attraction and it occurs between hydrogen and more electronegative atoms (like F, N and O) and that too covalently bound atoms. Two atoms- one is hydrogen bond acceptor and other hydrogen bond donor.   Fig: Water molecule showing intermolecular hydrogen bonding Hydrogen bonding is of two types:

• Intermolecular: it occurs within two molecules.
• Intramolecular: it occurs within a single molecule.

Hydrogen bonding is stronger than Vander Waal forces but weaker than that of ionic and covalent bonds. Following are the characters of compounds having hydrogen bonding:

• High boiling point due to intermolecular bonding because it requires more energy to break the hydrogen bond.
• Size of atom and electronegativity are the factors affect hydrogen bonding.