B2H6 is a reducing agent, O2 is an oxidizing agent.
Reactants:
B2H6 – Diborane(6)
Other names: Diborane, Boroethane, Boron hydrideDiboron hexahydride, B2H6
Appearance: Colorless gas ; Colourless compressed gas with characteristic odour ; Colorless gas with a repulsive, sweet odor. [Note: Usually shipped in pressurized cylinders diluted with hydrogen, argon, nitrogen, or helium.]