Which of the following orders regarding the bond length is correct?

As bond order increases bond length decreases.

The bond order of species are: $\frac{no . of electrons in B . M . O - no . of electrons in A . B . M . O}{2}$

$For O_{2}, B . O . = \frac{10 - 6}{2} = 2 For O_{2}^{+}, B . O . = \frac{10 - 5}{2} = 2.5 For O_{2}^{-}, B . O . = \frac{10 - 7}{2} = 1.5$

So, B.O. sequence is: $O_{2}^{+} > O_{2} > O_{2}^{-} and the order of bond lengths is : O_{2}^{-} > O_{2} > O_{2}^{+}$

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