Among the following metal carbonyls , the C-O bond order is lowest in :

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. `[Mn(CO)_(6)]^(+)` B. `[V(CO)_(6)]^(-)` C. `[Cr(CO)_(6)]` D. `[Fe(CO)_(5)]`
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