• # question_answer During the change of ${{O}_{2}}$to $O_{2}^{-},$the incoming electron goes to the orbital : [JEE Main 10-4-2019 Morning] A) $\sigma {{*}^{2}}{{P}_{z}}$                  B) ${{\pi }^{2}}{{P}_{y}}$C) $\pi *\,{{\,}^{2}}{{P}_{x}}$D) $\pi {{\,}^{2}}{{P}_{x}}$

A complex having strong field ligand has tendency to absorb light of highest energy. Among the three complexes. ${{\left[ Co{{(N{{H}_{3}})}_{6}} \right]}^{+3}}$will absorb radiation of highest energy and least wavelength. ${{\left[ Co{{(N{{H}_{3}})}_{5}}{{H}_{2}}O \right]}^{+3}}$has field weaker than the above compound and therefore absorb radiation of lesser energy and more wavelength. ${{\left[ CoCl{{(N{{H}_{3}})}_{5}} \right]}^{+2}}$has the weakest field and therefore will absorb light of least energy and highest wavelength. Strength of ligand $N{{H}_{3}}>{{H}_{2}}O>Cl.$        Molecular orbital diagram of ${{O}_{2}}$is             An incoming electron will go in $\pi _{2{{p}_{x}}}^{*}$ orbital.