1.

An organic compound A ,C_(4)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 one reaction with hydrazine gives a cyclised compound D (C_(10)H_(10)N_(2)) . identifyA,B,C and D. Explain the formation of D from c.

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