Reaction With Hydrazine

An organic compound (A) C_8 H_4 O_3 , in dry bebzene 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 cyclide compound (D) (C_(14) H_(10) N_2) . Identify (A), (B) (C ), and (D) Explain the formation of (D ) from (C ).

Assertion : Aldehydes or ketones on heating with hydrazine and KOH or pot, tert butoxide in high boiling solvent such as ethylene glycol give the reduced product. Reason : The reaction is known as Clemmensen's readuction.

In the following reaction hydrazine is oxidized N_(2) N_(2)H_(4)+OH^(-)toN_(2)+H_(2)O+e The equivalent weight of N_(2)H_(4) (hydrazine) is: