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Saturday, 31 October

JEE Main 2022 · ChemistryMultiple choiceOtherMediumMulti-step

JEE Main 27 June 2022, Shift 1, Chemistry Q76

Question 76 of 90 in this shift, Chemistry question 16 of 30, Section A.

Which of the following reactions will yield benzaldehyde as a product ? (A) [figure: benzene ring bearing COOH] →(ii) H2/Pd/BaSO4(i) SOCl2, Quinoline\xrightarrow[\text{(ii) H}_2/\text{Pd/BaSO}_4]{\text{(i) SOCl}_2\text{, Quinoline}} (B) [figure: benzene ring bearing CH2OH\mathrm{CH_2OH}] →CrO3/H2SO4\xrightarrow{\mathrm{CrO_3/H_2SO_4}} (C) [figure: benzene ring bearing a carbonyl carbon (C=O) bonded to OCH3\mathrm{OCH_3}] →(ii) PCC(i) NaBH4\xrightarrow[\text{(ii) PCC}]{\text{(i) NaBH}_4} (D) [figure: benzene ring bearing CH3\mathrm{CH_3}] →(ii) H3O+, Δ(i) CrO3, (CH3CO)2O\xrightarrow[\text{(ii) H}_3\text{O}^+\text{, }\Delta]{\text{(i) CrO}_3\text{, (CH}_3\text{CO)}_2\text{O}}

The figure, in words

Four drawn reaction schemes (A)-(D), each a benzene ring with one substituent (COOH; CH2OH; C(=O)OCH3; CH3) and reagents over/under the arrow as in the stem.
  1. (1)(B) and (C)
  2. (2)(C) and (D)
  3. (3)(A) and (D)Official answer
  4. (4)(A) and (C)

Official answer

Option 3

NTA final key.

Chapter
Aldehydes, Ketones and Carboxylic Acids
Topic
Carboxylic Acids and Derivatives
Idea tested
Rosenmund Reduction

Same idea in other shifts

Asked 6× in all
  1. 30 Jan 2024, Shift 1 · Q76[Reaction: benzoyl chloride (benzene ring bearing C(=O)Cl) →H2, Pd−BaSO4\xrightarrow{\mathrm{H_2,\ Pd-BaSO_4}} benzaldehyde (benzene ring bearing…EasySingle correctHas a figure
  2. 27 Jul 2022, Shift 2 · Q74Match **List - I** with **List - II**. List - I (A) C6H5COCl\mathrm{C_6H_5COCl} →Pd−BaSO4H2\xrightarrow[\mathrm{Pd-BaSO_4}]{\mathrm{H_2}}…MediumMatch the listHas a figure
  3. 24 Feb 2021, Shift 2 · Q50Match List - I and List - II. List - I | List - II (a) R−C(=O)−Cl→R−CHO\mathrm{R-C(=O)-Cl \rightarrow R-CHO} | (i) Br2\mathrm{Br_2}/NaOH (b)…MediumMatch the listHas a figure
  4. 25 Feb 2021, Shift 1 · Q45The major product of the following chemical reaction is : CH3CH2CN\mathrm{CH_3CH_2CN}…EasySingle correct
  5. 6 Sep 2020, Shift 2 · Q29The correct match between Item - I (starting material) and Item - II (reagent) for the preparation of benzaldehyde is : Item - I / Item -…EasyMatch the list

Question text from the official JEE Main paper published by NTA; answer from the final answer key. Chapter, topic and idea tags, difficulty and skill are Lumi’s. This question needs a figure we do not reproduce; it is described in words above. Lumi analyses 108 of the 174 JEE Main shifts held from 2017 to 2026.