1. Tardigrade
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  3. Chemistry
  4. Among the following metal carbonyls, the C-O bond order is lowest in

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Q. Among the following metal carbonyls, the $C-O$ bond order is lowest in

IIT JEEIIT JEE 2007Coordination Compounds

Solution:

Greater the extent of $d\pi -p \pi $ back bonding, smaller will be the bond order of $CO$ bond in metal carbonyls. In $Fe(CO)_5 , $ there is maximum number of valence shell electrons ($d$-electrons), greatest chances of $p \pi - d \pi $ back bonding, lowest bond order of $CO$ bond.