WHAT IS HYDROGEN BOND

WHAT IS HYDROGEN BOND 

it is an electrostatic attractive force between covalently bonded H- atom of one molecule and an electronegativity atom(F, O, N,)  
2)H-bond form in a polar covalent bond,,

OR

Hydrogen bonding is a special type of dipole-dipole attraction between molecules, not a covalent bond to a hydrogen atom. It results from the attractive force between a hydrogen atom covalently bonded to a very electronegative atom such as an N, O, or F atom and another very electronegative atom.

element	electronegativity value
H	2.1
N	3.0
O	3.5
F	4.1

The MAIN CONDITION FOR H-BONDING-1)H-bonding should be covalently bonded with high electronegativity element like F, N, O, 2)atomic size of electronegativity element should  be a small size 

F>O>N

3)strength of H- bond directly proportion to the atomic size of the element  (F, O, N)TYPES OF H-bonding it is a two type 1) intermolecular H- bonding 2) intramolecular H-bonding 1) intermolecular H-bonding -:

H-bond formation between two or more molecule of either the same or diffrent compound know as intermolecular H-bonding -; these are two type -:1)Homointermolecular H-bonding 

2)Hetrointermolecular H-bonding

1)Homointermolecular H-bonding-:

H-bond between molecule of same compound. H-bond represented by  dotted line ,,,,,

2)Hetrointermolecular H- bond  -: 

H- bond between molecule of diffenrent compound ,,,

2) intramolecular H-bonding-:

H-bonded with elecrtonigativity  (F,O,N,) element of  function g.p. , form H-boond with an other elecrtonigativity element present on nearest position on the same molecule. 

2) this type of H-  bond occured in organic chemistry,,,, 

Effect on H- bonding -; physical properties -:1) solubility-: few organic compounds  (non-polar )are soluble in water due to H - bonding ex-: glucose, fructose, etc,,,  2)M.P. and B.P. -: M.P and B.P. is directly proportion  to intermolecular H- bonding