The kinetics of Rh(III) Catalysed oxidation of Crotonic acid (CA) by Ce(IV) in sulphuric acid medium has been investigated. The reaction show first order kinetics with respect to Ce(IV), Crotonic acid (CA) and Rh(III) negligible effect of [H+], and ionic strength of the medium. The rate decrease in dielectric constant of the medium has been observed in Rh(III) catalysed reaction. The product of oxidation in reaction are acetaldehyde and glyoxalic acid. Activation parameters have been computed and mechanistic step, consistent with the kinetic result, reaction stoichiometry and product analysis for catalysed reaction have been discussed.