Consider conversion of MnCl₂ into

$$\begin{gathered} \left(\mathrm{I}\right) {\mathrm{MnCl}}_3 \left(\mathrm{II}\right) {\mathrm{MnO}}_2 \\ \left(\mathrm{III}\right) {\mathrm{MnO}}_4^{2-} \left(\mathrm{IV}\right) {\mathrm{MnO}}_4^{-} \end{gathered}$$

Increasing order of equivalent weights of MnCl₂ in these conversions is