This course covers the theories related to the Wave Mechanical Concept of the covalent bond beyond Lewis theory.

The following are the highlights of the course –

• A brief idea about wavefunction.

• Valence Bond Theory – Its postulates and limitations.

• Molecular Orbital Theory –

What is M. O. Theory?

Conditions for the combination of Atomic Orbitals – The LCAO concept.

Effective overlap of Atomic Orbitals – The symmetry conditions.

Types of Molecular Orbitals and how we obtain them? (sigma and pi M. O.)

Distribution of Molecular Orbitals and its discrepancy – Orbital mixing.

The concept of s-p Mixing.

Bonding and Antibonding M. O.s – What do they mean?

• Construction of Molecular Orbital Diagrams – How to draw M. O. diagrams?

Homonuclear molecules – H, He, Li, Be, B, C, N, O, F and Ne molecules;

Various types of Oxygen ions.

Heteronuclear molecules – The concept behind heteronuclear M. O. diagram construction.

CO, NO and HF.

• Calculation of Bond Order.

• Comparative analysis of Valence Bond and Molecular Orbital Theories.

• The VSEPR concept – Salient Features

Relation with Hybridization, Bond angle, and Electron Pairs.

Applying VSEPR theory to –

Molecules with regular geometry –

BeF2, BCl3, CH4, PF5, SF6, IF7

Molecules with irregular geometry –

IF5, ClF3, SF4, XeF2, I3-, XeOF2

• Tips and tricks to flawlessly predict molecular geometries using VSEPR.

• Applying VSEPR concept – explained with few practice problems.