The systems of bromobenzene with chlorine and iodine monobromide in carbon tetrachloride have been investigated at $25^{circ}$ by means of ultraviolet spectrophotometric measurements. The results indicate the formation of one to one molecular complexes, $C_6H_5Br{cdot}Cl_2$ and $C_6H_5Br{cdot}IBr$, in solution. The equilibrium constants obtained at $25^{circ}$ for the formation of these two complexes are 0.0485 and $0.183l{cdot}mole^{-1}$, respectively. Comparison of these results with those reported in the literature on other complexes of similar type shows that the relative stabilities of the complexes decrease in the following orders: $ICl>IBr>I_2>Br_2>Cl_2$Benzene > bromobenzene > chlorobenzene.