An organic compound A `(C_(7)H_(6)Cl_(2))` on treatment with NaOH solution gives another compound B `(C_(7)H_(6)O)`. B on oxidation gives and acid C `(C_(7)H_(6)O_(2))` which on treatment with a mixture of conc. `HNO_(3)" and "H_(2)SO_(4)` gives a compound D `(C_(7)H_(5)NO_(4))`. B on treatment with conc. NaOH gives a compound E `(C_(7)H_(8)O)" and "C_(6)H_(5)COONa`. Deduce the structures of [A], [B], [C], [D] and [E].
