In which of the following ionization processes the bond energy increases and the magnetic behaviour changes from paramagnetic to diamagnetic:

Step-by-step solution

The molecular configuration is depicted below: Molecular orbital configuration of aligned & O ₂ 1 s^2 ^* 1 ~s ^2 2 s^2 ^* & 2 s^2 2 p _z^2 2 p^2 _x 2 p^2 _y & ^* 2 p _x^1 ^* 2 p^1 _y & Paramagnetic & Bond order = 10-6 2 =2 & O ₂⁺ 1 s^2 ^* 1 s^2 2 s^2 & ^* 2 s^2 2 p^2 _z 2 p _x^2 & 2 p^2 _y ^* 2 p^1 _x & Paramagnetic & Bond order = 10-5 2 =2.5 & C ₂ 1 s^2 ^* 1 s^2 2 s^2 & ^* 2 s^2 2 p^2 _x 2 p^2 & Diamagnetic & Bond order = 8-4 2 =2 & C ₂⁺ 1 s^2 ^* 1 s^2 2 s^2 & ^* 2 s^2 2 p^2 _x 2 p^1 _y aligned aligned & Paramagne