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Saturday, 31 October

JEE Main 2021 · ChemistryMultiple choiceDiagram basedMediumConceptual

JEE Main 4 August 2021, Shift 2, Chemistry Q46

Question 46 of 90 in this shift, Chemistry question 16 of 30, Section A.

For the compounds below given [structures I, II, III, IV: see figure_note] the correct order of basicity is

The figure, in words

Four drawn structures labelled I-IV. I: six-membered ring with double bonds drawn and an N atom (with two dots) at the bottom ring position. II: same ring with N (two dots) at the bottom and CH3 attached at the top ring position. III: six-membered ring with double bonds and an NH2 group (two dots on N) attached at the top. IV: ring with N (two dots) at the bottom and, at the top ring position, an N atom (two dots) bonded to two CH3 groups.
  1. (1)III < I < II < IVOfficial answer
  2. (2)I < II < IV < III
  3. (3)I < II < III < IV
  4. (4)III < IV < I < II

Official answer

Option 1

NTA final key.

Chapter
Amines
Topic
Amines
Idea tested
Basicity of Nitrogen Heterocycles

Same idea in other shifts

Asked 5× in all
  1. 9 Apr 2024, Shift 1 · Q78Correct order of basic strength of Pyrrole (five-membered ring with NH), Pyridine (six-membered aromatic ring with N) and Piperidine…MediumSingle correctHas a figure
  2. 27 Jan 2024, Shift 1 · Q77Which of the following is strongest Bronsted base ?EasyDiagram basedHas a figure
  3. 9 Jan 2020, Shift 2 · Q39The decreasing order of basicity of the following amines is :MediumSingle correctHas a figure
  4. 5 Sep 2020, Shift 1 · Q27The increasing order of basicity of the following compounds is :MediumDiagram basedHas a figure

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.