Electronic Configuration of Molecules — Prelims Questions

Which of the following species has a bond order of 2.5 and is paramagnetic?

Which of the following diatomic species is diamagnetic?

Arrange the following species in increasing order of their bond dissociation energy: O$_2^+$, O$_2$, O$_2^-$, O$_2^{2-}$

Which of the following statements about the C$_2$ molecule is incorrect?

Which of the following pairs of species are isoelectronic and have the same bond order?

Which of the following statements is true regarding the stability of He$_2$ and He$_2^+$?