Hydrogen bond_chem_bsc

first let's know the defination of the hydrogen bonding:

the attratcive electrostatic force between a hydrogen atom which is alredy covelently attached with a strongly electronegative atom of a molecule and another electronegative atom of some other molecule(same molecule or different molecule) is known as hydrogen bond.

OR you can also define it as

Under appropriate condition a hydrogen atom may be linked to two similar or different electroneagative atoms. it id bonded to one of the two atoms by a covelent bond while to the other atom it is attached by a special type of bond which is much weaker then the covelent bond and is called hydrogen bond.

second type of hydrogen bond  (2015 AU)

there are two types of hydrogen bond they are:

1. Inter-molecular hydrogen bond(Association): this type of H-bond occours between two or more molecules of same or differnet compounds. thus NH3, H2O, and HF molecule are associated with inter-molecular hydrogen bond.
2. intra-molecular hydrogen bond(Chelation): this type of H-bond is formed between a H-atom and a electronegative atom present in the same molecule(intra means within). in Intera-molecular H-bonding, the H-atom is bounded to two atoms of the same molecule. this type of h-bonding may lead to linking of two groups to forma ring structure and such a effect is one kind of chelation.

the following topic need to add later.

nature of hydrogen bond 

properties of hydrogen bond

types of hydrogen bond

significance of hydrogen bond