A) \[\text{Mn(CO)}_{\text{6}}^{\text{+}}\]
B) \[\text{Cr(CO)}_{\text{6}}^{{}}\]
C) \[\text{V(CO)}_{\text{6}}^{-}\]
D) \[\text{Fe(CO)}_{5}^{{}}\]
Correct Answer: A
Solution :
As positive charge on the central metal atom increases, the less readily the metal can donate electron density into the anti-bonding n-orbitals of CO ligand to weaken 'the C-O bond. Hence, the C-O bond would be strongest in \[Mn(CO)_{6}^{+}.\]
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