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Kinetics and Mechanism of Oxidation of 2,4-Dichlorobenzoic Acid and p-Chlorobenzoic Acid by Dichromate in Presence and Absence of Succinic Acid

A. S. Kulkarni, B. K. Bongane, P. G. Gavali and N. T. Patel

Kinetics of oxidation of organic acid, such as 2,4-dichlorobenzoic acid and p-chlorobenzoic acid by dichromate in acetic acid-water medium in presen ce of perchloric acid. The oxidising reacting species. HCrO – 4 & Cr 2 O 2– 7 participate in the reaction. Th e effect of varying concentration of [substrate], [oxidant], [H + ], added neutral salt have been studied. It has been found that, the order of reaction with respect to [oxidant] and [substrate] found to be unity from the slope of plots log k v/s log [sub]. The rate of reaction increases with decrease in pH of pe rchloric acid. Hammett’s acidity function & activity of water have been studied. Effect of temperature has also been studied. Activation parameters were computed. The plot of Δ H * vs Δ S * is linear. The effect of substituents on the rate of reaction have been studied