1.

An organic compound (A) C_(8)H_(4)O_(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 hdyrazine gives a cyclized compound (D)C_(14)H_(10)N_(2). Identify (A), (B), ( C ), and (D). Explain the formation of (D) from ( C ).

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