Hydrogen bond

 Hydrogen bond 

definition of hydrogen bond: the attractive electrostatic force between a hydrogen atom which is already covalently attached with a strongly electronegative atom of a molecule and another electronegative atom of some other molecule is known as hydrogen bond.

Properties of hydrogen bond 

a hydrogen bond is a bond of hydrogen between two electronegative atoms only. bond energy of a hydrogen bond is in the range of 3 to 10 kilo calorie per mole. the formation of a hydrogen bond does not involved in sharing of electron pairs only oxygen, nitrogen and fluorine are capable of forming hydrogen bond. like a covalent bond hydrogen bond has a preferred bonding direction. 

Significance of hydrogen bonding

physical state of water: without hydrogen bonding, water would have existed as a gas .structure of compounds: hydrogen bond is is directional and on this account it helps in studying and establishing the structure of many compounds like ice, solids acid etc .explanation of polymerization: hydrogen bonding gives a satisfactory explanation for the mechanism of polymerization. application in biological investigation: hydrogen bonding also exist in molecules of living system proteins like various tissues and organs etc .food materials: molecules of most of our food materials like sugars, carbohydrates etc are consists of hydrogen bonding.