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Among the following metal carbonyls the `C-O` bond order is lowest in .

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Among the following metal carbonyls the `C-O` bond order is lowest in .
A. `[V(CO)_(6)]^(-)`
B. `Fe(CO)_(5)]`
C. `[Cr(CO)_(6)]`
D. `Mn(CO)_(6)]^(+)`
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As increase of electron density back bonding tendency of `pi^(*)` MO of CO increases, so C-O bond order decreases.
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