Hydrocarbon A has the formula C9H12 and absorbs 3 equivalents of H2 to yield B,
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 (CH3COOH) and the
tricarboxylic acid E. Propose structures for compounds A-D, and write the reactions.