Effect Of Hydrogen Bonding
Chemical Bonding of Class 11
EFFECT OF HYDROGEN BONDING
Hydrogen bonding has got a very pronounced effect on certain properties of the molecules. As
State of the substance:
H2O exists in liquid state whereas H2S in gaseous state because hydrogen bonding exist in water and no H-bonding exists in H2S.
Solubility:
The organic compounds like alkane, alkenes, alkynes are insoluble in water due to absence of H-bonding whereas alcohols, organic acids, amines are soluble in water due to H-bonding.
Boiling point:
High boiling and melting points of NH3 ,H2O and HI in comparison to hydrides of other elements of V, VI and VII groups to which N, O and F belong respectively are due to hydrogen bonding.
Acidity of different isomers:
Strength of certain acids and bases can be explained on the basis of hydrogen bonding eg. when we compare the acidic strength of o – m – and p – hydroxyl benzoic acid.
The abnormally high dissociation constant of o – hydroxybenzoic acid is due to the fact that the conjugate base is stabilised by hydrogen bonding.
These can be evident from the following examples.
- Introduction
- Electrovalency
- Covalency
- General Properties Of Ionic And Covalent Bonds
- CO-Ordinate Covalency
- Hybridization
- Vsepr Theory (Valence Shell Electron Pair Repulsion Theory)
- Rule For Determination Of Total Number Of Hybrid Orbitals
- Resonance
- Rules For Writing Resonating Structures
- Deviation From Ideal Behavior
- Factors Governing Polarization And Polarisability (Fajan's Rule)
- Dipole Moment In Aromatic Ring System
- Percentage Of Iconic Character
- Hydrogen Bonding
- Types Of Hydrogen Bonding
- Effect Of Hydrogen Bonding
- Importance Of Hydrogen Bonding In Biological Systems
- Intermolecular-Forces
- Molecular Orbital Theory
- Inert Pair Effect
- Back Bonding
- Exercise 1
- Exercise 2
- Exercise 3
- Exercise 4
- Exercise 5
