What are the limitations of the molecular orbital theory? Explain.for eg. Does the Molecular Orbital Theory only apply to compounds with total no....

Molecular Orbital theory is a very good tool in explaining
many of the molecular properties, though it too has certain lilmitations:              
 1. Molecular Orbital theory is based on quantum mechanical principles and hence hard to
conceive, especially for the beginners. 2. It does not give any idea of molecular
geometry, shape etc. 3. Although it can successfully describe many a properties,
explanation of all the molecular properties or bonds is beyond its ambit. A combination
of VBT and MOT is required for a more complete understanding. 4. It becomes exceedingly
cumbersome, if not impossible, to explain bonding in polyatomic molecules on the light
of MOT alone.