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  4. The bond order between Ni — C bond in Ni(CO)4 is

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Q. The bond order between $ Ni — C $ bond in $ Ni(CO)_{4} $ is

AMUAMU 2014Coordination Compounds

Solution:

$CO$ form synergistic $\pi$ back bonds with transition metals. It includes three components to give a partial triple bond. A $\sigma$ bond is formed by the overlapping of non-bonding $sp$-hybridised electron pair of $C$ with the blend of $d, s$ and $p$ orbitals of metal. Filled $d$ -orbitals of the metal also overlaps with a pair of $\pi$ anti-bonding orbitals of carbon of $CO$. To form such a bond, the oxidation state of metal atom must be lower than two