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Saturday, 31 October

JEE Main 2021 · ChemistryMultiple choiceSingle correctMediumConceptual

JEE Main 22 July 2021, Shift 2, Chemistry Q43

Question 43 of 90 in this shift, Chemistry question 13 of 30, Section A.

Which one of the following compounds does not exhibit resonance ?

The figure, in words

Option 4 is a drawn structure: a benzene ring (drawn with alternating double bonds) bearing one CH2OH substituent.
  1. (1)CH3CH2OCH=CH2\mathrm{CH_3CH_2OCH=CH_2}
  2. (2)CH3CH2CH=CHCH2NH2\mathrm{CH_3CH_2CH=CHCH_2NH_2}Official answer
  3. (3)CH3CH2CH2CONH2\mathrm{CH_3CH_2CH_2CONH_2}
  4. (4)[figure: benzene ring with a CH2OH\mathrm{CH_2OH} substituent]

Official answer

Option 2

NTA final key.

Chapter
Organic Chemistry: Some Basic Principles and Techniques
Topic
Resonance and Hyperconjugation
Idea tested
Resonance Structures

Same idea in other shifts

Asked 3× in all
  1. 25 Jul 2021, Shift 1 · Q41Which one among the following resonating structures is not correct ?MediumDiagram basedHas a figure
  2. 25 Jul 2021, Shift 2 · Q38Identify the species having one π\pi-bond and maximum number of canonical forms from the following :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. 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.