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Which of the following has longest C-O b...

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

A

`[Fe(CO)_4]^(2-)`

B

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

C

` Ni(CO)_4`

D

`[Co(CO)_4]^(-)`

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