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MCQEasyJEE 2026Aldehydes & Ketones

JEE Chemistry 2026 Question with Solution

Match List - I with List - II.

List-I contains reagents H2 with Pd-BaSO4, SnCl2 with HCl, CrO2Cl2 with CS2, and CO with HCl and anhydrous AlCl3; List-II contains Etard, Rosenmund Reduction, Gattermann-Koch, and Stephen Reaction.

Choose the correct answer from the options given below :

  • A

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

  • B

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

  • C

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

  • D

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

Answer

Correct answer:B

Step-by-step solution

Standard Method

Given: A matching question between List-I reagents and List-II named reactions involving aldehydes.

Find: The correct correspondence between the reagents and the named reactions.

From the solution:

  • A. H2,Pd−BaSO4H_2, Pd-BaSO_4 gives Rosenmund Reduction (II).
  • B. SnCl2,HClSnCl_2, HCl gives Stephen Reaction (IV).
  • C. CrO2Cl2,CS2CrO_2Cl_2, CS_2 gives Etard Reaction (I).
  • D. CO,HCl,Anhyd. AlCl3CO, HCl, Anhyd.\ AlCl_3 gives Gatterman - Koch Reaction (III).

Therefore, the correct match is A-II, B-IV, C-I, D-III.

The correct option is B.

Common mistakes

  • Confusing Rosenmund Reduction with Lindlar's catalyst usage in alkyne reduction is incorrect here because the listed reagent is being used for reduction of acid chlorides to aldehydes. Match it here with Rosenmund Reduction, not alkyne hydrogenation.

  • Matching SnCl2,HClSnCl_2, HCl with the wrong named reaction is a common error. This reagent set is characteristic of the Stephen Reaction, where nitriles are reduced and then hydrolyzed to aldehydes.

  • Associating CrO2Cl2,CS2CrO_2Cl_2, CS_2 with a general oxidation instead of the Etard Reaction is wrong. In this context, chromyl chloride specifically indicates side-chain oxidation of toluene derivatives to aldehydes.

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