Which is not correct about valence bond ...

Which is not correct about valence bond theory of metals

It is also called resonance theory

It was proposed by Linus Pauling

The metallic bond is essentially a polar (or) non polar covalent bond

It explains metallic lustre

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Which statement is NOT correct ? (According to Valence bond theory)

For the correct assignment of electronic configuration of a complex, the valence bond theory often requires the measurement of

Valence bond theory for bonding in transition metal complexes was developed by Pauling. From the valence bond point of view, formation of a complex involves reaction between Lewis bases (ligands) and a Lewis acid (metal atom or metal ion) with the formation of coordination covalent (or dative) bonds between them. The model utilizes hybridization of metal s, p and d valence orbitals to account for the observed structures and magnetic properies of complexes. Valence bond theory is able to deal satisfactorily with many stereo chemical and magnetic properies but is has nothing to say about electronic spectra or the reason for the kinetic inertness of chromium (III) and low spin cobalt (III) octahedral complexes. To understand this and more other features of transition metal we must turn to other theories like crystal field theory etc. Pure crystal field theory assumes that the only interaction between the metal ion and the ligands is an electrostatic or ionic one with the ligands being regarded as negative point charges. This theory is quite successful in interpreting many important properties of complexes. Select the correct statement about the crystal field theory.

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