Which of the following has longest $C - O$ bond length? (Free $C - O$ bond length in $CO$ is $1.128 A °$ )

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$Ni (CO)_{4}$

${[Co (CO)_{4}]}^{-}$

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

${[Fe (CO)_{4}]}^{2 -}$

answer is A.

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Detailed Solution

${[Fe (CO)_{4}]}^{2 -}$ has longest C−O bond length. Since in the complex, metal atom is carrying maximum negative charge, it
would show maximum synergistic bonding, due to which C–O bond length would be maximum.

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