A) \[\overset{\text{*}}{\mathop{\text{ }\!\!\pi\!\!\text{ }}}\,\]orbital
B) \[\text{ }\!\!\pi\!\!\text{ }\]orbital
C) \[\overset{\text{*}}{\mathop{\sigma }}\,\]orbital
D) \[\overset{{}}{\mathop{\sigma }}\,\]
Correct Answer: A
Solution :
During change of \[{{\text{O}}_{\text{2}}}\] to \[\text{O}_{\text{2}}^{\text{-}},\]the electron adds on h orbital. Molecular orbital configuration of \[\text{O}_{\text{2}}^{{}}\] (total \[{{e}^{-}}=16\]) \[\sigma (1{{s}^{2}}),\overset{*}{\mathop{\sigma }}\,(1{{s}^{2}}),\overset{*}{\mathop{\sigma }}\,(2{{s}^{2}})\sigma (2p_{z}^{2}),\] \[\pi (2p_{x}^{2})\approx \pi (2p_{y}^{2}),\overset{*}{\mathop{\pi }}\,(2p_{x}^{1})\approx \overset{*}{\mathop{\pi }}\,(2p_{y}^{1})\]and configuration of\[\text{O}_{\text{2}}^{\text{-}}\text{,}\] (total \[{{e}^{-}}=17\]) \[\sigma (1{{s}^{2}}),\overset{*}{\mathop{\sigma }}\,(1{{s}^{2}}),\overset{*}{\mathop{\sigma }}\,(2{{s}^{2}})\sigma (2p_{z}^{2}),\] \[\pi (2p_{x}^{2})\approx \pi (2p_{y}^{2}),\overset{*}{\mathop{\pi }}\,(2p_{x}^{2})\approx \overset{*}{\mathop{\pi }}\,(2p_{y}^{1})\]
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