In which of the following processes, the bond order has increased and paramagnetic character has changed to diamagnetic?

Step-by-step solution

According to molecular orbital theory Bond order = ( e -   i n   b o n d i n g   m o l e c u l a r   o r b i t a l )   - ( e -   i n   A n t i   b o n d i n g   M o l e c u l a r   o r b i t a l ) 2 Molecular orbital configuration. A O 2 ⟹ σ 1 s 2 < σ * 1 s 2 < σ 2 s 2 < σ * 2 s 2 < σ   2 p x 2 < π 2 p y 2 = π 2 p z 2 < σ * 2 p y 1 = π * 2 p y 1 B . O . = 6 - 2 2 = 2 O 2 + ⟹ &#96