Assertion : C-O bond in metal carbonyls is lo | vedclass

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(A) In metal carbonyls,a $\pi$-bond arises from the overlap of filled $d$-orbitals on the metal with empty $\pi^*$-antibonding orbitals of the $CO$ li

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If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.

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(A) In metal carbonyls,a $\pi$-bond arises from the overlap of filled $d$-orbitals on the metal with empty $\pi^*$-antibonding orbitals of the $CO$ ligand.This back-bonding increases the electron density in the antibonding orbital of $CO$,which weakens the $C-O$ bond compared to free $CO$.As a result,the $C-O$ bond order decreases and the bond length increases.Therefore,both the Assertion and Reason are correct,and the Reason is the correct explanation of the Assertion.

Assertion : $C-O$ bond in metal carbonyls is long.
Reason : There is delocalisation of electrons from filled $d$ orbitals into the empty $\pi^*$ orbitals on the $CO$ ligands.

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Assertion : $C-O$ bond in metal carbonyls is long.Reason : There is delocalisation of electrons from filled $d$ orbitals into the empty $\pi^*$ orbitals on the $CO$ ligands.