P-hydroquinone (H2Q) has been gamma-irradiated in the presence of O2 and different alcohols in acidic solutions. In the presence of tert-BuOH, the oxidation products were quinone(q), 2-hydroxybenzoquinone (2-Q-OH) and hydrogen peroxide (H2O2). In case of propan-2-ol, ethanol and methanol, the oxidation products were as above in addition to a carbonyl compound. A chain reaction was observed in case of propan-2-ol and this was inhibited by H2Q. The dependence of G(Q) and G(H2O2) on pH is a titration-type curve and the species responsible for this curve is assumed to be the protonated and unprotonated alcohol peroxy radicals.