The correct pair of orbitals involved in pi-b | vedclass

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(A) In metal carbonyl complexes,the $M-C$ $\sigma$-bond is formed by the donation of a lone pair of electrons from the carbonyl carbon into a vacant o

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metal $d_{xy}$ and carbonyl $\pi^{*}$

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(A) In metal carbonyl complexes,the $M-C$ $\sigma$-bond is formed by the donation of a lone pair of electrons from the carbonyl carbon into a vacant orbital of the metal.The $M-C$ $\pi$-bond (back-bonding) is formed by the donation of a pair of electrons from a filled $d$-orbital of the metal (such as $d_{xy}$,$d_{yz}$,or $d_{zx}$) into the vacant antibonding $\pi^{*}$-orbital of carbon monoxide.Therefore,the correct pair of orbitals involved in $\pi$-bonding is a metal $d$-orbital (like $d_{xy}$) and the carbonyl $\pi^{*}$-orbital.

The correct pair of orbitals involved in $\pi$-bonding between metal and $CO$ in metal carbonyl complexes is

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