Which amongst the following is incorrect statement?

1. Electronic configuration of ${C}_{2}$ molecule is \left(\sigma1{s}^{2}\right)\left({\sigma}^{*}1{s}^{2}\right)\left(\sigma2{S}^{2}\right)\left({\sigma}^{*}2{S}^{2}\right)\left(\pi2{P}_{x}^{2} = \pi2{py}^{2}\right)$</p><p>Hence it has$4$electrons in$\pi$molecular orbitals.</p><p>2.${{H}_{2}}^{+}$has one electron as one electron is removed from${H}_{2}$molecule.</p><p>3. Electronic configuration of${{O}_{2}}^{+}$ion is</p><p>$\sigma2{s}^{2}{\sigma}^{*}2{s}^{2}\sigma2{p}_{2}^{2}\left({\pi}_{2{P}_{x}^{2}} = {\pi}_{2{Py}^{2}}\right){\pi}^{*}2{p}_{x}^{1}{\pi}^{*}2{P}_{y}^{0}$</p><p>It has one unpaired electron so it is para-magnetic.</p><p>4. Bond orders of${O}_{2}^{+}, {O}_{2}, {O}_{2}^{-} and {O}_{2}^{2 -} are $2 . 5, 2, 1 . 5 and 1$ respectively.