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An organic compound [A] C(8)H(6) on reac...

An organic compound [A] `C_(8)H_(6)` on reacting with dilute sulphuric acid containing mercuric sulphate gives a compound [B] which can also be obtained from a reaction of bezene with acid chloride in the presence of anhydrous `AlCl_(3)`. The compound [B] when treated with iodine and aqueous NaOH yields [C] and a yellow compound [D]. Identify [A],[B],[C] and [D] with justification. Show how [B] is formed from [A].

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