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(C) The $C-O$ bond length in metal carbonyl complexes depends on the extent of back-bonding (synergic bonding) from the metal to the $CO$ ligand. Grea

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$[Ni(CO)_3(PMe_3)]$

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(C) The $C-O$ bond length in metal carbonyl complexes depends on the extent of back-bonding (synergic bonding) from the metal to the $CO$ ligand. Greater back-bonding increases the electron density in the antibonding $\pi^*$ orbital of $CO$,which decreases the $C-O$ bond order and increases the $C-O$ bond length. $PMe_3$ is a better $\sigma$-donor ligand compared to $PF_3$ and $CO$. Therefore,in $[Ni(CO)_3(PMe_3)]$,the electron density on the $Ni$ atom is higher,which leads to greater back-donation into the $CO$ ligands. Consequently,$[Ni(CO)_3(PMe_3)]$ exhibits the maximum $C-O$ bond length.

Which of the following complexes has the highest $C-O$ bond length?

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