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(D) In metal carbonyls,the metal-carbon bond is formed by the donation of lone pair electrons from $CO$ to the metal (sigma donation) and the back-don

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$\pi$-backbonding strengthens $M-C$ bond order & weakens $CO$ bond order

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(D) In metal carbonyls,the metal-carbon bond is formed by the donation of lone pair electrons from $CO$ to the metal (sigma donation) and the back-donation of electrons from the metal $d$-orbitals to the empty antibonding $\pi^*$ orbitals of $CO$ ($\pi$-backbonding).This $\pi$-backbonding increases the electron density in the antibonding $\pi^*$ orbital of $CO$,which decreases the $CO$ bond order.Simultaneously,the $\pi$-backbonding introduces partial double bond character to the $M-C$ bond,thereby increasing the $M-C$ bond order.

Select the true statement from the following for metal carbonyls?

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Assertion : $C-O$ bond in metal carbonyls is long.
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