Excess molar enthalpies H-E and excess molar volumes V-E have been measured, as a function of mole fraction x(1), at 298.15 K and atmospheric pressure for the five liquid mixtures (x(1)1,4-C6H4F2 + x(2)n-ClH2l+2), l = 7, 8, 10, 12 and 16. In addition, H-E and excess molar heat capacities C-P(E) at constant pressure have been determined for the two liquid mixtures (x(1)C(6)F(6) + x(2)n-ClH2l+2), l = 7 and 14, at the same temperature and pressure. The instruments used were flow microcalorimeters of the Picker design (the H-E version was equipped with separators) and a vibrating-tube densimeter, respectively. The excess enthalpies of the five difluorobenzene mixtures are all positive and quite large; they increase with increasing chain length l of the n-alkane from H-E(X(1) = 0.5)/(J mol(-1))= 1050 for l = 7 to 1359 for l = 16. The corresponding excess volumes V-E are all positive and also increase with increasing l : V-E(X(1) = 0.5)/(cm(3) mol(-1)) = 0.650 for l = 7 and 1.080 for l = 16. Interestingly, the excess enthalpies of the corresponding mixtures with hexafluorobenzene are only about 5% larger, whereas the excess volumes of (x(1)C(6)F(6) + x(2)n-ClH2l+2) are roughly twice as large as those of their counterparts in the series containing 1,4-C6H4F2. Specifically, at 298.15 K H-E(X(1) = 0.5)/(J mol(-1)) = 1119 for (x(1)C(6)F(6) + x(2) n-C7H16) and 1324 for (x(1)C(6)F(6) + x(2)n-C14H30), and for the same mixtures V-E(x(1) = 0.5)/(cm(3) mol(-1)) = 1.882 and 2.093, respectively. The excess heat capacities for both systems are negative and of about the same magnitude as the excess heat capacities of mixtures of fluorobenzene with the same n-alkanes (Roux et al., 1984) : C-P(E)(x(1) = 0.5)/(J K-1 mol(-1)) = -1.18 for (x(1)C(6)F(6) + x(2)n-C7H16), and -2.25 for (x(1)C(6)F(6) + x(2)n-C14H30). The curve C-P(E) vs. (x(1) for x(1)C(6)F(6) + x(2)n-C14H30) shows a sort of "hump" for x(1) 0.5, which is presumed to indicate emerging W-shape composition dependence at lower temperatures.