Question

Please explain hydrogen bond

Answer 1

A hydrogen bond is a type of attractive (dipole-dipole) interaction between an electronegative atom and a hydrogen atom bonded to another electronegative atom. This bond always involves a hydrogen atom. Hydrogen bonds can occur between molecules or within parts of a single molecule.

Answer 2

Hydrogen bond is actually a force which binds the molecules together...

For example : In water molecule, 2 Hydrogen elements make bond with Oxygen element...you can see this how hydrogen and oxygen together combined by sharing their electrons ( i.e making covalent bond -> bond which is formed by sharing of electron...)
Here bond between O and H is not a hydrogen bond..It is actually a covalent bond between these elements...

But When You see a bulk of water i.e, lots of water molecules live together just becuase of this Hydrogen Bond...

In a bulk of these molecules, Lets consider any two of the molecules of H20...Here O is electron rich as it has got more number of electrons..so it is more electronegative..and In case of hydrogen..it is an electron deficit as it has got only one electron....
Electron deficient Hydrogen of one H2O molecule starts making bond with another molecule of H2O with Oxygen element in the bulk...Here the New bond so formed between H2O molecules called Hydrogen bond..

Note that bond which form H20 Molecule is a covalent bond and the bond which hold these molecules together is a hydrogen bond..This is reason why H20 molecules live together...

Hope this help...