Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
COMEDK20269 May 2026Morning ShiftChemistryAldehydes and KetonesActual

Etard reaction is a method of preparation of benzaldehyde by oxidation of toluene. The oxidizing agent used in this reaction is:

Options

  1. APyridinium chlorochromate
  2. BChromic oxide
  3. CPotassium dichromate
  4. DChromyl chloride

Correct answer

D. Chromyl chloride

Step-by-step solution

The Etard reaction involves the oxidation of toluene to benzaldehyde. The oxidizing agent used in this reaction is chromyl chloride ( CrO₂Cl₂ ) dissolved in a non-polar solvent such as CS₂ or CCl₄ . The reaction proceeds via the formation of a brown chromium complex, which upon hydrolysis yields benzaldehyde. Answer: Chromyl chloride

Practice Aldehydes and Ketones on Quantrex Academy →

More from Aldehydes and Ketones

Which one of the following is the correct statement? 2026Match the reactions in List I with the final products formed as given in List II. List I List II W C ₆ H ₅ CH ₃ (i) CrO ₃ + ( CH ₃ CO )₂ O ; (ii) H ₂ O + heat P R ₂ CO X RCOOC ₂ H 2026Identify products [P₁ ] and [P₂ ] formed when Benzonitrile undergoes the following reactions. 2026Which of the following is NOT TRUE about nucleophilic addition reactions of aldehydes? 2026Propanal on reaction with dilute NaOH, undergoes aldol condensation resulting in the formation of a compound A. Identify the correct structure of A and name of the compound. 2026What are X and P in the following reaction sequence? 2026C ₃ H ₆ (i) BH ₃; (ii) H ₂ O ₂/ NaOH P CrO ₃, anhydrous medium Q (i) CH ₃ MgBr ; (ii) H ₂ O R + Mg(OH)Br The organic compounds P, Q and R are 2026Match the reagents in List-I with products obtained from their carbonyl compounds in List-II. List-I List-II (a) NH ₂ OH (i) Cyanohydrin (b) R- NH ₂ (ii) Oxime (c) R- OH (iii) Schi 2026 Full Aldehydes and Ketones list All COMEDK PYQs