Chemical Bonding And Molecular Structure

Which among the following processes is/are associated with increasing bond order but no change in diamagnetic/paramagnetic behaviour?

(i) $\mathrm{N}_2 \rightarrow \mathrm{~N}_2^{+}+\mathrm{e}^{-}$

(ii) $\mathrm{O}_2 \rightarrow \mathrm{O}_2^{+}+\mathrm{e}^{-}$

(iii) $\mathrm{O}_2+\mathrm{e}^{-} \rightarrow \mathrm{O}_2^{-}$