Question

 An organic compound A, C₈H₄O₃, in dry benzene in the presence of anhydrous AlCl₃ gives compound B. The compound B, on treatment with PCl₅, followed by reaction with H₂ / Pd(BaSO₄) gives compound C, which on reaction with hydrazine gives a cyclised compound D (C₁₄H₁₀N₂ ). Identify A, B, C, and D. Explain the formation of D from C.

Answer 1

Hence. compounds