Arrange the following in decreasing order of C-O bond lengths giving justifications: Ni(CO)₄, [Co(CO)₄] - , [Fe(CO)₄] ^2- .

The order of decreasing C-O bond lengths in the given compounds is as follows:

1. [Fe(CO)4]^2- (Longest C-O bond)
2. [Co(CO)4]^-
3. Ni(CO)4 (Shortest C-O bond)

Justification:

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