Excess molar volumes (V-E) and isentropic compressibilities (k(s)) for binary mixtures of o-xylene with 1-propanol, 1-butanol and 1-pentanol have been measured at 303.15 K Excess volume exhibits an inversion in sign in all the three binary mixtures. Further, deviation in isentropic compressibility (K-s) from ideal behaviour was also calculated. K-s values exhibits an inversion in sign for the binary mixture o-xylene + 1-propanol and the quantity is positive over the entire range of composition in the remaining two mixtures. The experimental sound velocity data have been analysed in terms of Free length theory (FLT) and Collision factor theory (CFT). The measured data is explained on the basis of intermolecular interactions between unlike molecules.