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Saturday, 31 October

JEE Main 2024 · ChemistryMultiple choiceMatch the listMediumConceptual

JEE Main 4 April 2024, Shift 1, Chemistry Q74

Question 74 of 90 in this shift, Chemistry question 14 of 30, Section A.

Match List I with List II : List - I (Mechanism steps) List - II (Effect) (A) [structure: aniline, lone pair on NH2_2 donated into ring, resonance with N+H2\mathrm{N^+H_2}= ring and carbanion] — (I) −- E effect (B) [structure: cyclohexene + H+\mathrm{H^+} →\rightarrow cyclohexyl carbocation with H] — (II) −- R effect (C) [structure: cyclohexene + CˉN\bar{\mathrm{C}}\mathrm{N} →\rightarrow cyclohexyl carbanion with CN] — (III) ++ E effect (D) [structure: nitrobenzene resonance, O←N=O\mathrm{O{\leftarrow}N{=}O} on ring giving ring carbocation and N→O\mathrm{N{\rightarrow}O} with O−\mathrm{O^-}] — (IV) ++ R effect Choose the correct answer from the options given below :

The figure, in words

List-I are four mechanism-step drawings: (A) aniline resonance (NH2 lone pair into ring, giving N+H2= ring with carbanion); (B) cyclohexene + H+ giving cyclohexyl carbocation (H on ring, + on adjacent carbon); (C) cyclohexene + CN- giving cyclohexyl carbanion (- on ring, CN on adjacent carbon); (D) nitrobenzene resonance (O<-N=O on ring giving ring cation and N->O with :O-). List-II: (I) -E effect (II) -R effect (III) +E effect (IV) +R effect.
  1. (1)(A) - (IV), (B) - (III), (C) - (I), (D) - (II)Official answer
  2. (2)(A) - (III), (B) - (I), (C) - (II), (D) - (IV)
  3. (3)(A) - (I), (B) - (II), (C) - (IV), (D) - (III)
  4. (4)(A) - (II), (B) - (IV), (C) - (III), (D) - (I)

Official answer

Option 1

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 9× in all
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  3. 9 Apr 2024, Shift 1 · Q89How many compounds among the following compounds show inductive, mesomeric as well as hyperconjugation effects ? [figure: eight…MediumNumerical valueHas a figure
  4. 1 Feb 2024, Shift 2 · Q73The functional group that shows negative resonance effect is :EasySingle correct
  5. 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
  6. 8 Jan 2020, Shift 1 · Q41Arrange the following compounds in increasing order of C−-OH bond length : methanol, phenol, p-ethoxyphenolMediumSingle correct
  7. 9 Jan 2020, Shift 2 · Q40Which of the following has the shortest C-Cl bond ?MediumSingle correct
  8. 4 Sep 2020, Shift 2 · Q39Among the following compounds, which one has the shortest C−-Cl bond ?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.