Ultrasonic absorption and velocity measurements were made as a function of temperature for the binary mixtures of benzene-coconut oil and hexane-β, β′-dichloroethyl ether. Ultrasonic absorption at 5, 7, 10, 15, 21, and 25 MHz and above Tc is a analyzed by the dynamic scaling theory of Ferrell and Bhattacharjee (FB). The ultrasonic absorption of the two binary mixtures exhibit strong temperature and frequency dependence near Tc. Ultrasonic velocity behaves as a linearly decreasing function of temperature above the critical temperature satisfying linear relation. The observed of αc/f2 Vs. f−1.06 yields a straight line as predicted by FB theory. Experimental values of α/αc for the two binary critical mixtures are compared to the scaling function F(ω*).