Apparent molar volume, limiting apparent molar volume, semi-empirical parameter, Falkenhagen and Jones-Dole viscosity coefficients were evaluated for N-(4-bromophenyl) maleanilic acid and N-(4-bromophenyl) maleimide in 80% aqueous dimethyl sulphoxide at 308.15K.From theses parameters, molecular interactions and their extent present in the solution were predicted.