An organic compound A, `C_8H_4O_3`, in dry benzene in the presence of anhydrous `AlCl_3` gives compound B. The compoun

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Q 2678201106.     An organic compound A, `C_8H_4O_3`, in dry benzene in the
presence of anhydrous `AlCl_3` gives compound B. The
compound B on treatment with `PCl_5`, followed by reaction
with `H_2//Pd/(BaSO_4)` gives compound C, which on reaction
with hydrazine gives a cyclised compound D `(C_14H_10N_2)`.
Identify A, B, C and D. Explain the formation of D from C.
JEE 2000

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