`RNH_2` reacts with `C_6H_5SO_2Cl` in aqueous `KOH` to give a clear solution. On acidification a precepitate is obtained which is due to the formation of

Hinsberg reagent is benzenesulfonyl chloride. In aqueous KOH this reacts with primary amine (RNH_(2)) to give a clear solution which on acidification gives a white on acidification gives a white precipitate, which is due to the formation of

Sodium carbonate reacts with SO_(2) in aqueous medium to give

An amine reacts with C_(6)H_(5)SO_(2)Cl and the product is soluble in alkali, amine is

The amine which reacts with p-toluenesulphonyl chloride to give a clear solution which on acidification gives insoluble compound is __________.

Potassium dichromate acts as a strong oxidising agent in the acidic medium. When heated with a metal chloride and conc. sulphuric acid, it gives orange red fumes. On passing these fumes through sodium hydroxide, it gives a yellow solution (X) and this acidified solution gives yellow precipitate (Y) with lead acetate. On heating potassium dichromate with KOH, it forms a yellow solution (Z) which on acidification changes to orange colour. Acidified solution of dichromate ion gives deep blue colour with H_2O_2 due to the formation of (P) The orange red fumes obtained on heating potassium dichromate with a metal chloride and conc. H_2SO_4 is due to the formation of

A white substance (A) reacts with dilute H_(2)SO_(4) to produce a colourless suffocating gas (B) and a colourless solution (C )/ The reaction of gas (B) with potassium iodate and starch solution produce a blue colour solution. Aqueous Solution of (A) gives a white precipitate with BaCl_(2) solution which is soluble in dilute HCl . Addition of aqueous NH_(3) or NaOH to (C ) produced first a precipitate which dissolves in excess of the respective reagent to poduced a clear solution. Similarly addition of excess of potassium ferrocyanide to (C ) produced a precipitate (D) which also dissolves in aqeous NaOH giving a clear solution. Identify (A),(B),(C ) and (D ). Write the equation of the reactions involved.

Ammonia reacts with K_(2)[HgI_(4)] in the presence of KOH solution to give a