Abstract
The kinetics of oxidation of a series of meta and para substituted benzaldehydes by chromic acid has been re-investigated in acetic acid water mixture with a view on the search for resonance effects of para substituents. The overall order of the reaction is two, first order in each reactant at constant acidity. The products of oxidation were found to be the corresponding carboxylic acids. Hammett's reaction constants (ρm) and (ρp) for meta and para substituents were calculated separately and found to be 0.851 and 1.23, respectively. The reason for the higher ρp value with respect to ρm is discussed. The resonance parameters for para substituents were calculated and discussed.
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