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Kinetic study of oxidation of D-Arabinose has been investigated in presence of bromide catalyst in aq. Sulphuric acid medium at constant ionic strength. The reaction is of first order each in D-Arabinose and [Ce(4)]. The rate of reaction decreases on increasing the concentration of H+ ion. The sulphate and bisulphate ions show retarding effects on the reaction rate at constant ionic strength. The bromide ion exihibits the +ve catalytic effects on the reaction rate. The value of activation energy has been calculated and a suitable mechanism conforming to the kinetic data proposed.