QJEEM19Chbb45: JEE Main 2019 Chemistry - Class 11 JEEM19Chbb45 Solution: During the change of O 2 to O 2 - , the incoming electron goes…

Question

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During the change of O₂ to O₂^- , the incoming electron goes to the orbital :

Accepted Answer

Molecular orbital configuration of O₂ (16 electrons) is

{\sigma _{1{s^2}}}\,\sigma _{1{s^2}}^ * \,{\sigma _{2{s^2}}}\,\sigma _{2{s^2}}^ * \,{\sigma _{2p_z^2}}\,{\pi _{2p_x^2}}\, = \,{\pi _{2p_y^2}}\,\pi _{2p_x^1}^ * \, = \,\pi _{2p_y^1}^ *

Molecular orbital configuration of O₂^- (17 electrons) is

{\sigma _{1{s^2}}}\,\sigma _{1{s^2}}^ * \,{\sigma _{2{s^2}}}\,\sigma _{2{s^2}}^ * \,{\sigma _{2p_z^2}}\,{\pi _{2p_x^2}}\, = \,{\pi _{2p_y^2}}\,\pi _{2p_x^2}^ * \, = \,\pi _{2p_y^1}^ *

So, the incoming electron goes to

\pi _{2p_x}^ *

or

\pi _{2p_y}^ *

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