Which of the following is paramagnetic?

Step-by-step solution

Key Idea If all the electron in a molecule are paired, the molecule is diamagnetic and if there are unpaired electrons in a molecule, it is paramagnetic. Molecular orbital configuration of given molecules are as follows: (1) N ₂( Z =14)- ls ^2, ^* 1 ~s ^2, 2 ~s ^2, ^* 2 ~s ^2, 2 p _ x ^2= 2 p _ y ^2, 2 p _ z ^2 It is a diamagnetic molecule due to absence of unpaired electron. (2) H ₂( Z =2)-1 ^2 It is a diamagnetic molecule. (3) Li ₂( Z =6)- ls ^2, ^* 1 ~s ^2, 2 ~s ^2 It is a diamagnetic molecule. (4) O ₂( Z =16)-