The kinetics of oxidation of phenoxyacetic acid by imidazolium dichromate in presence of oxalic acid has been studied in 50% acetic acid- water medium at 313 K. The order with respect to phenoxyacetic acid and Imidazolium dichromate were both one and fractional order with respect to oxalic acid and perchloric acid. The decrease in dielectric constant of the medium increases the rate of the reaction. Increase in ionic strength by the addition of sodium perchlorate has no effect on the rate constant. There is no polymerization with acrylonitrile. The reaction has been conducted at four different temperatures and activation parameters were calculated. p-benzoquinone has been identified as the product of oxidation. A suitable mechanism and rate law in consonance with the observed facts is proposed.