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

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

$Ni {(CO)}_{4}$

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

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

answer is A.

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Detailed Solution

$[Fe {(CO)}_{4}]^{2 -}$ has the longest C–O bond. Because the complex metal atom has the most negative charge, it will exhibit the most synergistic bonding, causing the C-O bond length to be at its maximum.

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