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Among the following metal carbonyls, the...

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

A

`[Mn(CO)_6]^(+)`

B

`[Fe(CO)_5]`

C

`[Cr(CO)_6]`

D

`[V(CO)_6]^(-)`

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The correct Answer is:
D
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