Question

Match List-I with List-II:

• A. A-III, B-IV, C-II, D-I
• B. A-IV, B-III, C-I, D-II
• C. A-I, B-IV, C-II, D-III
• D. A-III, B-I, C-IV, D-II

Answer 1

The Correct Option is A

To solve this matching problem between List-I and List-II, we need to understand the properties and functions of reagents in organic chemistry. Here’s the explanation of the correct matches: 

• A - Lucas Reagent: Lucas reagent is a solution of anhydrous zinc chloride in concentrated hydrochloric acid. It is used to test for alcohols presence and classify their reaction rates into primary, secondary, and tertiary. Tertiary alcohols react immediately to give a cloudy appearance. Thus, A matches with III.
• B - Carbylamine Reaction: This is a chemical test for primary amines, forming an isocyanide or carbylamine. It is noted for its foul smell. Therefore, B matches with IV.
• C - Iodoform Test: Iodoform test is used to identify methyl ketones and alcoholic groups like ethanol. The test results in the formation of a yellow precipitate of iodoform. Hence, C matches with II.
• D - Tollens' Test: Tollens' reagent is used to determine the presence of an aldehyde. It forms a silver mirror on the inner surface of the test tube. Therefore, D matches with I.

Based on the explanations, the correct matching is: A-III, B-IV, C-II, D-I.

Answer 2

The provided matching and explanations are correct. Here's a summary:

List I - Reagents and List II - Chemical Composition/Use:

• (A) Tollen's Reagent: (III) Ammonical silver nitrate
  • Tollen's Reagent is an ammoniacal solution of silver nitrate (AgNO₃).
  • It's used to detect aldehydes, which are oxidized to carboxylic acids, while Ag⁺ is reduced to metallic silver (silver mirror).
• (B) Jones Reagent: (IV) Chromium tetroxide sulphuric acid
  • Jones Reagent is a solution of chromium trioxide (CrO₃) in sulfuric acid (H₂SO₄).
  • It's a strong oxidizing agent used to oxidize primary alcohols to carboxylic acids and secondary alcohols to ketones.
• (C) Lucas reagent: (II) conc HCl and ZnCl₂
  • Lucas reagent is a solution of anhydrous zinc chloride (ZnCl₂) in concentrated hydrochloric acid (HCl).
  • It's used to distinguish between primary, secondary, and tertiary alcohols based on their reactivity with HCl.
• (D) Fehling Solution: (I) Rochelle salt
  • Fehling Solution contains copper(II) sulfate (CuSO₄) and Rochelle salt (potassium sodium tartrate).
  • It's used to detect aldehydes, which reduce Cu²⁺ to Cu₂O (red precipitate).

Therefore, the correct matching is: A-III, B-IV, C-II, D-I