The incorrect statement with respect to valence bond theory

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The electrons in the metal orbitals may undergo regrouping even against Hund’s rule.

The electrons in an incompletely filled orbitals give rise to the resultant magnetic moment

Ligand orbitals overlap the vacant metal orbitals to form a strong coordinate covalent bond to the extent possible

The number of electrons lost is equal to the coordination number of the metal

answer is D.

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Detailed Solution

When metal forms coordination complex with the ligand, then pairing takes place in the presence of strong field ligand, which is against the Hund's rule.
More the unpaired electrons, more is the magnetic moment.
Ligands are electron rich species and they form a strong bond with empty orbitals of metal.
The fourth statement is not true and it is verified with an example.
Oxidation state of Ni in [Ni(CN)₄]^2- is +2 and the coordination number of Ni is 4.

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