4 hydroquinone + O2 <=> 4 benzosemiquinone + 2 H2O
4 hydroquinone + o2 <=> 4 benzosemiquinone + 2 h2o
4 hydroquinone + O2 <=> 4 benzosemiquinone + 2 H2O
4 hydroquinone + o2 <=> 4 benzosemiquinone + 2 h2o