3 C2-IIH5OH + 2 KMnVIIO4 3 C2-IH4O + 2 MnIVO2 + 2 KOH + 2 H2O

This is an oxidation-reduction (redox) reaction:

2 MnVII + 6 e- 2 MnIV (reduction)

6 C-II - 6 e- 6 C-I (oxidation)

KMnO4 is an oxidizing agent, C2H5OH is a reducing agent.