5 C4H8 + 24 KMnO4 + 36 H2SO4 → 24 MnSO4 + 12 K2SO4 + 20 CO2 + 56 H2O
This is an oxidation-reduction (redox) reaction:
24 MnVII + 120 e- → 24 MnII (reduction)
20 C-II - 120 e- → 20 CIV (oxidation)
KMnO4 is an oxidizing agent, C4H8 is a reducing agent.