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Saturday, 31 October

JEE Main 2021 · ChemistryMultiple choiceSingle correctMediumMulti-step

JEE Main 26 August 2021, Shift 1, Chemistry Q48

Question 48 of 90 in this shift, Chemistry question 18 of 30, Section A.

The correct sequential addition of reagents in the preparation of 3-nitrobenzoic acid from benzene is :
  1. (1)HNO3/H2SO4\mathrm{HNO_3/H_2SO_4}, Br2/AlBr3\mathrm{Br_2/AlBr_3}, Mg/ether, CO2\mathrm{CO_2}, H3O+\mathrm{H_3O^+}Official answer
  2. (2)Br2/AlBr3\mathrm{Br_2/AlBr_3}, NaCN, H3O+\mathrm{H_3O^+}, HNO3/H2SO4\mathrm{HNO_3/H_2SO_4}
  3. (3)Br2/AlBr3\mathrm{Br_2/AlBr_3}, HNO3/H2SO4\mathrm{HNO_3/H_2SO_4}, NaCN, H3O+\mathrm{H_3O^+}
  4. (4)Br2/AlBr3\mathrm{Br_2/AlBr_3}, HNO3/H2SO4\mathrm{HNO_3/H_2SO_4}, Mg/ether, CO2\mathrm{CO_2}, H3O+\mathrm{H_3O^+}

Official answer

Option 1

NTA final key.

Chapter
Aldehydes, Ketones and Carboxylic Acids
Topic
Carboxylic Acids and Derivatives
Idea tested
Carboxylic Acid Synthesis via Grignard and CO2

Same idea in other shifts

Asked 4× in all
  1. 2 Apr 2025, Shift 2 · Q68Consider the following reactions. From these reactions which reaction will give carboxylic acid as a major product ? (A)…MediumOtherHas a figure
  2. 30 Jul 2022, Shift 2 · Q45[figure: six-membered ring with three alternating double bonds bearing Br (printed Br); long arrow; six-membered ring with three…EasyDiagram basedHas a figure
  3. 27 Aug 2021, Shift 2 · Q42Which one of the following reactions will not yield propionic acid ?MediumSingle correct

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. Lumi analyses 108 of the 174 JEE Main shifts held from 2017 to 2026.