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Saturday, 31 October

JEE Main 2021 · ChemistryMultiple choiceSingle correctMediumConceptual

JEE Main 25 July 2021, Shift 2, Chemistry Q38

Question 38 of 90 in this shift, Chemistry question 8 of 30, Section A.

Identify the species having one π\pi-bond and maximum number of canonical forms from the following :
  1. (1)SO3\mathrm{SO_3}
  2. (2)SO2\mathrm{SO_2}
  3. (3)O2\mathrm{O_2}
  4. (4)CO32−\mathrm{CO_3^{2-}}Official answer

Official answer

Option 4

NTA final key.

Chapter
Chemical Bonding and Molecular Structure
Topic
Resonance and Hyperconjugation
Idea tested
Resonance Structures

Same idea in other shifts

Asked 3× in all
  1. 22 Jul 2021, Shift 2 · Q43Which one of the following compounds does not exhibit resonance ?MediumSingle correctHas a figure
  2. 25 Jul 2021, Shift 1 · Q41Which one among the following resonating structures is not correct ?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. Lumi analyses 108 of the 174 JEE Main shifts held from 2017 to 2026.