The disquac group contribution model for correlating and predicting the thermodynamic properties of liquid mixtures (phase diagrams and basic excess functions) is applied to some binary mixtures containing n-alkanals + cyclohexane, + benzene, + tetrachloromethane, and + 1-chloroalkanes. A fairly good description of the thermodynamic properties of mixing is obtained when the model is used with the group interaction parameters determined in the paper.