Match List I with List II
| List I | List II |
| (A) Tollen's Reagent | (I) Rochelle salt |
| (B) Jones Reagent | (II) conc HCl and \(ZnCl_2\) |
| (C) Lucas reagent | (III) Ammonical silver nitrate |
| (D) Fehling Solution | (IV) Chromium tetroxide sulphuric acid |
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 1
The correct answer is option 1. A-III, B-IV, C-II, D-I.
| List I | List II |
| (A) Tollen's Reagent | (III) Ammonical silver nitrate |
| (B) Jones Reagent | (IV) Chromium tetroxide sulphuric acid |
| (C) Lucas reagent | (II) conc HCl and \(ZnCl_2\) |
| (D) Fehling Solution | (I) Rochelle salt |
Let us explain each matching:
(A) Tollen's Reagent: (III) Ammonical silver nitrate
Tollen's Reagent is used to distinguish between aldehydes and ketones. It is a solution of silver ions in aqueous ammonia. In the presence of an aldehyde, Tollen's Reagent undergoes a redox reaction, where silver ions are reduced to form a silver mirror on the inner surface of the reaction vessel. This reaction is used as a qualitative test for the presence of aldehydes.
(B) Jones Reagent:(IV) Chromium tetroxide sulphuric acid
Jones Reagent is a mixture of chromium trioxide (\(CrO_3\)) and concentrated sulfuric acid (\(H_2SO_4\)). It is used as a powerful oxidizing agent in organic synthesis to convert primary and secondary alcohols to their corresponding aldehydes and ketones, respectively.
(C) Lucas reagent corresponds to: (II) conc HCl and \(ZnCl_2\)
Lucas reagent is a solution of concentrated hydrochloric acid (\(HCl\)) containing zinc chloride (\(ZnCl_2\)). It is used to distinguish between primary, secondary, and tertiary alcohols. Tertiary alcohols react rapidly with Lucas reagent to form a cloudy solution, whereas secondary alcohols react more slowly, and primary alcohols do not react at all under normal conditions.
(D) Fehling Solution: (I) Rochelle salt
Fehling Solution is used to distinguish between aldehydes and ketones. It is a mixture of Fehling's A solution (aqueous copper(II) sulfate) and Fehling's B solution (aqueous potassium sodium tartrate, also known as Rochelle salt). In the presence of an aldehyde, Fehling Solution undergoes a redox reaction, where the aldehyde is oxidized to a carboxylic acid, and the copper(II) ions in Fehling's A solution are reduced to form a red precipitate of copper(I) oxide.
Each reagent in List I has a specific chemical composition and is used for distinct qualitative tests in organic chemistry.
Therefore, the correct explanation for the matching is 1. A-III, B-IV, C-II, D-I