Q.

In which of the following processes, the bond order increases and paramagnetic character changes to diamagnetic one           [2023]

1 N2N2+  
2 NONO+  
3 O2O2+  
4 O2O22-  

Ans.

(2)

NO is paramagnetic with B.O = 2.5, NO+ is diamagnetic with B.O = 3.