C6H12O6 (aq) → 2 CO2 (g) + 2 CH3CH2OH (aq)
This is an oxidation-reduction (redox) reaction:
4 C0 + 8 e- → 4 C-II (reduction)
2 C0 - 8 e- → 2 CIV (oxidation)
C6H12O6 is both an oxidizing and a reducing agent (disproportionation (dismutation)).
This is a gas evolution reaction, CO2 is the formed gas.