5 C2-IIH5OH + 2 KMnVIIO4 + 3 H2SO4 5 C-IIIH3CIHO + 2 MnIISO4 + K2SO4 + 8 H2O

This is an oxidation-reduction (redox) reaction:

2 MnVII + 10 e- 2 MnII (reduction)

5 C-II - 15 e- 5 CI (oxidation)

5 C-II + 5 e- 5 C-III (reduction)

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