Question:
Among the following metal carbonyls, the $C-O$ bond order is lowest in
Among the following metal carbonyls, the $C-O$ bond order is lowest in
Updated On: Jun 14, 2022
- $[Mn(CO)_6]^+ $
- $[Fe(CO)_5] $
- $[Cr(CO)_6] $
- $[V(CO)_6]^- $
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The Correct Option is B
Solution and Explanation
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.
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Concepts Used:
Coordination Compounds
A coordination compound holds a central metal atom or ion surrounded by various oppositely charged ions or neutral molecules. These molecules or ions are re-bonded to the metal atom or ion by a coordinate bond.
Coordination entity:
A coordination entity composes of a central metal atom or ion bonded to a fixed number of ions or molecules.
Ligands:
A molecule, ion, or group which is bonded to the metal atom or ion in a complex or coordination compound by a coordinate bond is commonly called a ligand. It may be either neutral, positively, or negatively charged.