The densities and viscosities of eight ternary mixtures of the cyclic diether (1,3-dioxolane), water and monoalkanols; methanol, ethanol, 1-propanol, 2-propanol, 1-butanol, 2-butanol, t-butanol, i-amyl alcohol are determined over the entire range of composition at 303.15 K. From the experimental observations, the viscous synergy and antagonism, synergic and antagonic interaction index are derived by the equations developed by Kalentunc-Gencer and Peleg and Howell, respectively. A power factor, F-eta has also been introduced here. Also, the speeds of sound of these ternary mixtures have been measured over the whole composition range at the same temperature and thus, the isentropic compressibility and excess isentropic compressibility have been evaluated from the experimental data. The results are discussed in terms of molecular package, specific interactions and nature of liquid mixtures. The system studied here exhibit very strong cross association through hydrogen bonding. (c) 2006 Elsevier B.V. All rights reserved.