The kinetics of oxidation of isoamyl alcohol(IAA) by zinc dichromate(ZDC) has been studied in 40% acetic acid 60% water medium in the presence of perchloric acid at 303K. The reaction is first order each in zinc dichromate, isoamyl alcohol and hydrogen ion concentration. The rate of oxidation increases with decrease in dielectric constant of solvent suggests ion-diople interaction. Increase in ionic strength by the addition of sodium perchlorate has no effect on the rate constant. There is no polymerization with acrylonitrile and absence of free radical was proved. 3-methyl-1-butanal has been identified as a product of oxidation. The rate of the reaction has been conducted at four different temperatures and activation parameters were calculated. From the observed kinetic results, a suitable mechanism with rate law has been proposed.