Match  List - I with List - II.

choose the correct answer from the options given below :

A. Unsaturation (Baeyer's Test) $$\rightarrow$$ IV. Discharge of pink colour

Baeyer's reagent is a cold, alkaline solution of potassium permanganate ($$\text{KMnO}_4$$), which is deep pink/purple. When it reacts with an alkene or alkyne, the $$\text{MnO}_4^-$$ ion is reduced to $$\text{MnO}_2$$ (a brown precipitate), causing the pink colour to disappear (decolourise).

B. Alcoholic group (Ceric ammonium nitrate test) $$\rightarrow$$ I. Red colour appears

Ceric ammonium nitrate ($$\text{CAN}$$) is an orange-yellow reagent. When added to an alcohol, it forms a alkoxy cerium(IV) complex, which results in a characteristic wine-red colouration.

C. Aldehyde group (Tollen's reagent) $$\rightarrow$$ II. Silver mirror appears

Tollen's reagent contains the silver-ammonia complex $$[\text{Ag}(\text{NH}_3)_2]^+$$. Aldehydes reduce these silver ions to metallic silver, which deposits on the inner walls of the test tube, creating a shining silver mirror.

D. Phenolic group ($$\text{FeCl}_3$$ test) $$\rightarrow$$ III. Violet colour appears

Phenols react with neutral ferric chloride to form a coordination complex with the iron. For simple phenol, this complex is typically violet or purple, though other phenols can produce green or blue colours.