Which one of the following oxides is expected to exhibit paramagnetic behaviour?

Which one of the following molecules is expected to exhibit diamagnetic behaviour?

Which one of the following molecules is expected to exhibit diamagnetic behaviour-

Which one of the following molecules is expected to exhibit diamagnetic behaviour? (i) N_2 (ii) O_2 (iii) S_2 (iv) C_2

Which of the following species is expected to be paramagnetic ?

Which one of the following is expected to exhibit optical isomerism ?

Which one of the following complex is not expected to exhibit isomerism