Which of the following carbonyls will have th | vedclass

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(A) The strength of the $C-O$ bond in metal carbonyls depends on the extent of back-bonding from the metal $d$-orbitals to the $\pi^*$-antibonding orb

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$Mn(CO)_6^+$

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(A) The strength of the $C-O$ bond in metal carbonyls depends on the extent of back-bonding from the metal $d$-orbitals to the $\pi^*$-antibonding orbitals of the $CO$ ligand.As the negative charge on the metal complex increases,the metal atom becomes more electron-rich and donates more electron density into the $\pi^*$-orbitals of $CO$,which weakens the $C-O$ bond.Conversely,as the positive charge on the central metal atom increases,the metal's ability to donate electron density decreases.Therefore,the $C-O$ bond is strongest in the species with the highest positive charge or lowest negative charge,as there is minimal back-bonding.Among the given options,$Mn(CO)_6^+$ has the highest positive charge,resulting in the least back-bonding and the strongest $C-O$ bond.

Which of the following carbonyls will have the strongest $C-O$ bond?

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Among the given complexes that possess $CO$ ligand bridges are:
$\underset{I}{[Co_2(CO)_8]} \quad \underset{II}{[Fe_3(CO)_{12}]} \quad \underset{III}{[Mn_2(CO)_{10}]} \quad \underset{IV}{[Fe_2(CO)_9]}$

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