Which of the following carbonyls will have the strongest $C - O$ bond

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$V (CO)_{6}^{-}$

$Fe (CO)_{5}$

$Cr (CO)_{6}$

$Mn (CO)_{6}^{+}$

answer is C.

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Detailed Solution

As $+ v e$ charge on the central metal atom increases, the less readily the metal can donate electron density into the $π *$ orbitals of CO ligand to weaken the $C - O$ bond. Hence the $C - O$ bond would be strongest in $M n (C O)_{6}^{+}$

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