Densities rho of and speeds of sound u in binary mixtures cyclohexane + benzene and + benzaldehyde have been measured over the entire range of composition at atmospheric pressure and at temperatures ranging from (293.15 to 323.15) K using an Anton-Paar DSA 5000. From these data molar isentropic compressibilities K-S,K-m, thermal expansion coefficients alpha(p), excess molar volumes V-m(E), and excess molar isentropic compressibilities K-S,m(E) at all the temperatures, and excess thermal expansion coefficients alpha(E)(p) and isothermal pressure coefficient of excess molar enthalpy (partial derivative H-m(E)/partial derivative P)(T,x) at 298.15 K were calculated. The V-m(E) for both the mixtures are positive at all temperatures and over entire range of compositions. The K-S,m(E) are positive over entire composition for cyclohexane + benzene while K-S,m(E) curve is S-shaped for cyclohexane + benzaldehyde. The values of alpha(E)(p) are negative except for cyclohexane rich region in both the mixtures. The values of all the excess functions are lower for cyclohexane + benzaldehyde as compared to cyclohexane + benzene at all the temperatures and compositions. (C) 2012 Elsevier B.V. All rights reserved.