In the synergic bond of metal carbonyls,which | vedclass

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(A) In metal carbonyls,the metal-carbon bond possesses both $ \sigma $ and $ \pi $ character. $1$. The $ \sigma $ bond is formed by the donation of an

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$ \pi ^* $ molecular orbital of ligand is used

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(A) In metal carbonyls,the metal-carbon bond possesses both $ \sigma $ and $ \pi $ character. $1$. The $ \sigma $ bond is formed by the donation of an electron pair from the $ 	ext{CO} $ molecule into a vacant $ d $-orbital of the metal. $2$. The $ \pi $ bond (synergic bonding) is formed by the back-donation of electrons from a filled metal $ d $-orbital into the empty antibonding $ \pi ^* $ molecular orbital of the $ 	ext{CO} $ ligand. Therefore,the $ \pi ^* $ molecular orbital of the ligand is used in the synergic bond.

In the synergic bond of metal carbonyls,which of the following orbitals is involved?

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