Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
MHT CET202618 April 2026Morning ShiftChemistryAldehydes and KetonesActual

Identify the reagent 'R' used in the following reaction C ₆ H ₅ COCl R C ₆ H ₅ CHO + HCl

Options

  1. ACO , HCl
  2. BH ₂, Pd - BaSO ₄
  3. CDIBAl - H
  4. DH ₂ O

Correct answer

B. H ₂, Pd - BaSO ₄

Step-by-step solution

The given reaction is the conversion of benzoyl chloride ( C ₆ H ₅ COCl ) to benzaldehyde ( C ₆ H ₅ CHO ). This transformation is known as the Rosenmund reduction. The reagent used for this reaction is hydrogen gas in the presence of a palladium catalyst supported on barium sulfate ( H ₂, Pd - BaSO ₄ ). The barium sulfate acts as a catalytic poison that partially deactivates the palladium, preventing the further reduction of the newly formed aldehyde into an alcohol. Thus, the reagent 'R' is H ₂, Pd - BaSO ₄ . Answ

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. 2026Etard reaction is a method of preparation of benzaldehyde by oxidation of toluene. The oxidizing agent used in this reaction is: 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 2026 Full Aldehydes and Ketones list All MHT CET PYQs