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Answer» `pi` back bonding strengthens M - C bond order as well as CO bond order .
`pi` back bonding weakens M - C bond order as well as CO bond order
`pi` back bonding weakens M - C bond order but strengthens CO bond order
`pi` BACKBONDING strengthens M - C bond order and weakens CO bond order . Solution :The overlap of a LONE pair on the C atom with the empty hybrid metal orbitals forms a metal-to-carbon `pi`-bond. The transition metal atom in a metal carbonyl has filled non-bonding d-orbitals which are of proper symmetry to overlap with the anti-bonding orbitals of CO . The electronic charge is transferred from the filled non-bonding orbitals of the metal to `pi^(**)` orbitals of the ligand CO . This reduces the bond order of CO . The `pi` back-bonding strengthens the M-C bond order , it weakens the C-O bond order .
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