Speeds of sound, densities, refractive indices, and isentropic compressibilities, at the temperature 298.15 K of {x1C6H6 + x2c-C6H12 + (1 - x1 - x2)C6H5Cl} and the corresponding binary mixtures : {xC6H6 + (1 - x)c-C6H12}, {xC6H6 + (1 - x)C6H5Cl}, and {xc-C6H12 + (1 - x)C6H5Cl}, have been determined experimentally as a function of the mole fraction(s) at atmospheric pressure. Speeds of sound and densities were determined by density and sound analyzer Anton-Paar DSA-48 and refractive indices by the automatic refractometer ABBEMAT-HP Dr Kernchen. Variable-degree polynomials have been fitted to the results.