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An organic compound (A) (C(9)H(12)) gave...

An organic compound `(A) (C_(9)H_(12))` gave `(B) (C_(8) H_(6)O_(4))` on oxidation by alkaline `KMnO_(4) (B)` on heating does not from anhydride. Also , `(B)` reacts with `Br_(2)` in the presence of iron to give only one monobromo-derivative `(C)(C_(8)H_(5) BrO_(4))`. WHat are `(A), (B)`, and `(D)` ?

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