The quantum yields of formation of chloride ions were determined in photolysis (=254 nm) of watercarbon tetrachloride organic phase of CCl4(Cl–)=0.89±0.04 water-chlorobenzene (PhCl(Cl–)=0.137± ±0.005) two-phase systems and saturated aqueous solutions of carbon tetrachloride (CCl4(Cl–)=18.9±5.6 and chlorobenzene PhCl(Cl–)=0.56±0.03. The quantum yields of chloride ions obtained from these systems are compared with partial radiation yields in the same systems. A mechanism for formation of Cl– ions is proposed.