Multiple choice

Which of the following matches is incorrect?

  1. Barfoed’s reagent: Conc. HCl + anhydrous ZnCl2

  2. Baeyer’ reagent – dilute alkaline KMnO4

  3. Nessler’s reagent – alkaline solution of K2HgI4

  4. Etard’s reagent – CrO2Cl2

  5. Fenton’s reagent: FeSO4 + H2O2

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A Correct answer
Explanation

Barfoed's reagent consists of a 0.33 molar solution of neutral copper acetate (Cu(CH3COO)2) in 1% acetic acid (CH3COOH) solution. Lucas' reagent is a solution of anhydrous zinc chloride (ZnCl2) in concentrated hydrochloric acid (HCl).