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Saturday, 31 October

JEE Main 2021 · ChemistryMultiple choiceMatch the listMediumRecall

JEE Main 24 February 2021, Shift 2, Chemistry Q50

Question 50 of 90 in this shift, Chemistry question 20 of 30, Section A.

Match 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) R−CH2−COOH→R−CH(Cl)−COOH\mathrm{R-CH_2-COOH \rightarrow R-CH(Cl)-COOH} | (ii) H2\mathrm{H_2}/Pd−BaSO4-\mathrm{BaSO_4} (c) R−C(=O)−NH2→R−NH2\mathrm{R-C(=O)-NH_2 \rightarrow R-NH_2} | (iii) Zn(Hg)/Conc. HCl (d) R−C(=O)−CH3→R−CH2−CH3\mathrm{R-C(=O)-CH_3 \rightarrow R-CH_2-CH_3} | (iv) Cl2\mathrm{Cl_2}/Red P, H2O\mathrm{H_2O} Choose the correct answer from the options given below :

The figure, in words

In List-I each C=O is drawn with the O above the carbon; in (b) the Cl is drawn below the CH carbon.
  1. (1)(a)-(iii), (b)-(iv), (c)-(i), (d)-(ii)
  2. (2)(a)-(iii), (b)-(i), (c)-(iv), (d)-(ii)
  3. (3)(a)-(ii), (b)-(i), (c)-(iv), (d)-(iii)
  4. (4)(a)-(ii), (b)-(iv), (c)-(i), (d)-(iii)Official answer

Official answer

Option 4

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. 27 Jun 2022, Shift 1 · Q76Which of the following reactions will yield benzaldehyde as a product ? (A) [figure: benzene ring bearing COOH]…MediumOtherHas 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.