5 C2-IIH5OH + 2 KMnVIIO4 + 3 H2SO4 5 C2-IH4O + 2 MnIISO4 + K2SO4 + 8 H2O

This is an oxidation-reduction (redox) reaction:

2 MnVII + 10 e- 2 MnII (reduction)

10 C-II - 10 e- 10 C-I (oxidation)

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