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Friday, 9 October

JEE Main 2024 · ChemistryNumerical answerNumerical valueMediumMulti-step

JEE Main 9 April 2024, Shift 1, Chemistry Q89

Question 89 of 90 in this shift, Chemistry question 29 of 30, Section B.

How many compounds among the following compounds show inductive, mesomeric as well as hyperconjugation effects ? [figure: eight structures: anisole (OCH3\mathrm{OCH_3} on benzene); (CH3)2CH−CH=CH−C(=O)−CH3\mathrm{(CH_3)_2CH-CH=CH-C(=O)-CH_3} (skeletal enone); benzene; chlorocyclohexane; 2-nitro-isopropylbenzene (NO2\mathrm{NO_2} ortho to CH(CH3)2\mathrm{CH(CH_3)_2}); 2-nitro-(but-3-en-2-yl)benzene (NO2\mathrm{NO_2} ortho to CH(CH3)CH=CH2\mathrm{CH(CH_3)CH=CH_2}); m-xylene (two CH3\mathrm{CH_3} meta); 1-acetyl-2-methylcyclohexene (COCH3\mathrm{COCH_3} and CH3\mathrm{CH_3} on the ring double bond carbons)]

The figure, in words

Eight skeletal structures in two rows: row 1 anisole, (CH3)2CH-CH=CH-CO-CH3 enone, benzene, chlorocyclohexane; row 2 o-nitro-isopropylbenzene, o-nitro-(but-3-en-2-yl)benzene, m-xylene (two CH3 meta), 1-acetyl-2-methylcyclohexene.

Official answer

4

NTA final key.

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

Same idea in other shifts

Asked 6× in all
  1. 2 Apr 2026, Shift 2 · Q63Given below are two statements: Statement I: In…MediumSingle correct
  2. 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
  3. 29 Jan 2024, Shift 1 · Q72The interaction between π\pi bond and lone pair of electrons present on an adjacent atom is responsible forEasySingle correct
  4. 8 Jan 2020, Shift 1 · Q41Arrange the following compounds in increasing order of C−-OH bond length : methanol, phenol, p-ethoxyphenolMediumSingle correct
  5. 9 Jan 2020, Shift 2 · Q40Which of the following has the shortest C-Cl bond ?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 42 of the 174 JEE Main shifts held from 2017 to 2026.