Bond order of $\mathrm{O}_{2}^{+}=\frac{10-5}{2}=2.5$
Bond order of $\mathrm{O}_{2}^{-}=\frac{10-7}{2}=1.5$
Bond order of $\mathrm{O}_{2}^{2-}=\frac{10-8}{2}=1.0$
Bond order of $\mathrm{O}_{2}=\frac{10-6}{2}=2$
$(i)\, {CCl_3}^-$ $(ii)\,CCl_2$ $(iii)\, (SiH_3)_2O$ $(iv)\, N(SiH_3)_3$