What is incorrect about homoleptic metal carb | vedclass

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Question

(D) The statement in option $D$ is incorrect.In metal carbonyls,the metal-carbon bond possesses both $\sigma$ and $\pi$ character.Option $A$ is correc

Vedclass · Accepted Answer

Metal carbonyls contain only $\sigma$-bonds.

Vedclass · Answer

(D) The statement in option $D$ is incorrect.In metal carbonyls,the metal-carbon bond possesses both $\sigma$ and $\pi$ character.Option $A$ is correct: The $\sigma$-bond is formed by the donation of a lone pair of electrons from the carbonyl carbon to the vacant orbital of the metal.Option $B$ is correct: The $\pi$-bond is formed by the back-donation of electrons from a filled $d$-orbital of the metal into the vacant antibonding $\pi^*$-orbital of the carbon monoxide ligand.Option $C$ is correct: This back-donation creates a synergic effect that strengthens the $M-C$ bond while weakening the $C-O$ bond.

What is incorrect about homoleptic metal carbonyls?

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