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

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Which of the following has longest `C-O` bond length? (Free `C-O` bond length in CO is `1.128Å`).
A. `Ni(CO)_(4)`
B. `[Co(CO)_(4)]^(o-)`
C. `[Fe(CO)_(4)]^(2-)`
D. `[Mn(CO)_(6)]^(+)`
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Correct Answer - C
`[Fe(CO)_(4)]^(2-)` Since metal atom is carrying maximum -ve charge therefore it would show maximum synergic bonding as a result C-O bond length would be maximum .
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