The kinetics of oxidation of active methylenecompounds namely acetyl acetone (AA) and benzoyl acetone (BA) by Isoquinolinium bromochromate (IQBC) in acetic acid water medium in presence of H2SO4 have been investigated. The observed rate of oxidation is first-order in [IQBC] and [H+] while it is fractional-order in AA & BA. Addition of acetic acid to reaction mixture (v/v) increases reaction velocity constant. The main products of the oxidation are the corresponding triones. Thermodynamic parameters have been computed for the slow step of the proposed mechanism.