Jone’s reagent is:

• A. Acidified K₂Cr₂O₇ solution
• B. Alkaline K₂Cr₂O₇ solution
• C. CrO₃ in aqueous acetone
• D. A solution of K₂Cr₂O₇ / H₂SO₄ in aqueous ethanol

Jone's reagent is specifically known for its use in organic chemistry, particularly in the oxidation of alcohols. The correct answer is:

D. A solution of K₂Cr₂O₇ / H₂SO₄ in aqueous ethanol

This reagent is effective in converting primary and secondary alcohols into their corresponding aldehydes and ketones, respectively. It is a powerful oxidizing agent due to the presence of both potassium dichromate (K₂Cr₂O₇) and sulfuric acid (H₂SO₄) in the solution.

Key Points about Jone's Reagent

• Composition: Mixture of potassium dichromate and sulfuric acid in ethanol.
• Function: Oxidizes alcohols to carbonyl compounds.
• Application: Commonly used in laboratory settings for organic synthesis.