Chemical Bonding And Molecular Structure Question 368

Question: In $ O_2^{-}, $

$ O_2 $ and $ O_2^{-2} $ molecular species, the total number of antibonding electrons respectively are [DCE 2003]

Options:

A) 7, 6, 8

B) 1, 0, 2

C) 6, 6, 6

D) 8, 6, 8

Show Answer

Answer:

Correct Answer: A

Solution:

Molecular orbital electronic configuration of these species are : $ O_2^{-}(17{e^{-}})= $

$ \sigma 1s^{2}{{\sigma }^{*}}1s^{2},\sigma 2s^{2}{{\sigma }^{*}}2s^{2},\sigma 2p_x^{2},\pi 2p_y^{2}, $

$ \pi 2p_z^{2},{{\pi }^{*}}2p_y^{2}{{\pi }^{*}}2p_z^{1} $

$ O_2(16e)= $

$ \sigma 1s^{2}{{\sigma }^{*}}1s^{2},\sigma 2s^{2}{{\sigma }^{*}}2s^{2},\sigma 2p_x^{2},\pi 2p_y^{2}, $

$ \pi 2p_z^{2}{{\pi }^{*}}2p_y^{1}{{\pi }^{*}}2p_z^{1} $

$ O_2^{2-}(18e)= $

$ \sigma 1s^{2}{{\sigma }^{*}}1s^{2},\sigma 2s^{2}{{\sigma }^{*}}2s^{2},\sigma 2p_x^{2},\pi 2p_y^{2}, $

$ \pi 2p_z^{2}{{\pi }^{*}}2p_y^{2}{{\pi }^{*}}2p_z^{2} $
Hence number of antibonding electrons are 7,6,and 8 respectively.



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