Decreasing order of stability of O2O_2O2​, O2−O_2^{−}O2−​, O2+O_2^{+}O2+​ and O22−O_2^{2−}O22−​ is:

Decreasing order of stability of $O_2$ , $O_2^{−}$ , $O_2^{+}$ and $O_2^{2−}$ is: