The observed experimental parameters such as density (ρ), viscosity (η) and ultrasonic velocity (U) of ternary liquid mixtures of primary alkanols such as 1-pentanol, 1-hexanol, 1-heptanol and 1-octanol added in the fixed binary solvent mixtures of (ratio 4:2) N-N dimethyl formamide (DMF) and methyl isobutyl ketone (MIBK) at 303.15, 308.15 and 313.15K were determined. The observed experimental data have been utilized to evaluate some of the excess thermo acoustical parameters such as adiabatic compressibility (βE), intermolecular free length (LfE), free volume (VfE), internal pressure (πiE), Gibb’s energy (∆GE), viscosity (ηE) molar volume (VmE) and Grunberg’s interaction parameter (d). Our present study predicts the interaction between DM and 1alkanols is due to hydrogen bonding and latter there seems to be a dissociation of associ ated structure of 1-alkanols It is also noticed that on further addition of DMF causes such rupturing of hydrogen bonded association of 1-alkanols and leading to subsequent weakening of interaction between MIBK and 1-alkanols as well as between DMF and 1-alkanols. However, our further investigation reveals that the elevation of temperature over the liquid mixtures leading to strengthening of their interactions
