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Friday, 9 October

JEE Main 2021 · ChemistryMultiple choiceDiagram basedMediumDiagram reading

JEE Main 25 July 2021, Shift 1, Chemistry Q41

Question 41 of 90 in this shift, Chemistry question 11 of 30, Section A.

Which one among the following resonating structures is not correct ?

The figure, in words

Four resonance structures of a nitro-substituted conjugated diene system, differing in charge placement.
  1. (1)[figure: structure CH2=CH-CH(-)-CH(+)-N(+)(=O)O(-), i.e. vinyl group, carbanion carbon, adjacent carbocation carbon bearing the nitro group]Official answer
  2. (2)[figure: structure CH2=CH-CH(+)-CH(-)-N(+)(=O)O(-), i.e. vinyl group, carbocation carbon, adjacent carbanion carbon bearing the nitro group]
  3. (3)[figure: structure (+)CH2-CH(-)-CH=CH-N(+)(=O)O(-)... drawn as +, then carbon bearing -, then CH=CH attached to N(+)(=O)O(-)]
  4. (4)[figure: structure (+)CH2-CH=CH-CH=N(+)(O(-))O(-), i.e. extended conjugated chain ending in N with two O(-) and a positive charge on N]

Official answer

Option 1

NTA final key.

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

Same topic in other shifts

All Resonance and Hyperconjugation questions
  1. 2 Apr 2026, Shift 2 · Q63Given below are two statements: Statement I: In…MediumSingle correct
  2. 5 Apr 2026, Shift 2 · Q63IUPAC name of the some alkenes are given below. Find out the correct stability order. A. 2-Methylbut-2-ene B. ciscis-But-2-ene C. 2,…MediumSingle correct
  3. 6 Apr 2026, Shift 2 · Q63Shown below is the structure of methyl acetate with three different α\alpha, β\beta and γ\gamma carbon - oxygen bonds. The correct…MediumDiagram basedHas a figure
  4. 3 Apr 2025, Shift 2 · Q65Given below are two statements: Statement I : Hyperconjugation is not a permanent effect. Statement II : In general, greater the number of…EasyTwo statements
  5. 6 Apr 2024, Shift 2 · Q88Number of carbocations from the following that are not stabilized by hyperconjugation is ________.MediumNumerical valueHas a figure
  6. 9 Apr 2024, Shift 1 · Q71Relative stability of the contributing structures is : (I) CH2=CH−C∥O¨:−H\mathrm{CH_2=CH-\overset{\ddot{O}:}{\overset{\|}{C}}-H} ⟷\longleftrightarrow…MediumSingle correctHas 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 42 of the 174 JEE Main shifts held from 2017 to 2026.