Hydrocarbon A has the formula C₉H₁₂ and absorbs 3 equivalents of H₂ to yield R, C₉H₁₈, when hydrogenated over a Pd/C catalyst. On treatment of A with aqueous H₂SO₄ in the presence of mercury (II), two isomeric ketones, C and D, are produced. Oxidation of A with KMnO₄ gives a mixture of acetic acid (CH₃CO₂H) and the tricarboxylic acid E. Propose structures for compounds A?D, and write the reactions.

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CH2CO2H но-сCHснсH2Cо2н