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				   As per VB Theory of complex compounds, in [MnCl6]3-  Mn is said to undergo sp3d2 hybridisation forming outer orbital complex. There will be a vacant 3d orbital if 4s, 4p and 4d orbitals are filled with lone electron pairs drawn from six chloride ligands.

Whether VB Theory violates Aufbau principle inaddition to Hunds rule?

6 years ago


Answers : (2)

										you must understand that the hybridisation is done when Mn comes in vicinity of chloride ions. And just before hybridisation, there is a redistribution of energy. VB theory doesn't violates Aufbau principle. The enrgy levels shift.

But even then this explanation is not satisfactpry and is further dealed in CFT.

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Rahul- IIT Roorkee
6 years ago
										Dear Rao,

valence band theory does not violate Aufbau principle.

According to this theory a covalent bond is formed between the two atoms by the overlap of half filled valence atomic orbitals of each atom containing one unpaired electron. A valence bond structure is similar to a Lewis structure, but where a single Lewis structure cannot be written, several valence bond structures are used. Each of these VB structures represents a specific Lewis structure. This combination of valence bond structures is the main point of resonance theory. Valence bond theory considers that the overlapping atomic orbitals of the participating atoms form a chemical bond . Because of the overlapping, it is most probable that electrons should be in the bond region. Valence bond theory views bonds as weakly coupled orbitals (small overlap). Valence bond theory is typically easier to employ in ground state molecules.

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6 years ago

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