REACTION WITH HYDRAZINE

An organic compound (A), C_(8)H_(4) O_(3) in dry benzene in the presene of anhydorus AlCl_(3) gives compound (B) . 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_(14) H_(10) N_(2)) Idenyify (A),(B),(C) and (D) . Explain the formation of (D) from (C) .

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 ).

Write the general equations for the reaction of an aldehyde with (i) HCN (ii) Hydrazine.

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:

(A) D-Glucose and D-Mannose form identical osazone on reaction with excess of phenyl hydrazine (R) D-Glucose and D-Mannose are epimers differing in configuration at C-2 only.

An organic compound (A) adds Br_(2) to give C_(5)H_(8)Br_(2) O. It does not react with Tollens' reagent but entere into reaction with phenyl hydrazine. Ozonolysis of (A) gives an acetaldehyde and C_(3)H_(4)O_(2) which readily loses CO to form acetaldheyde. What it (A)?