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Saturday, 31 October

JEE Main 2023 · ChemistryMultiple choiceSingle correctHardConceptual

JEE Main 6 April 2023, Shift 1, Chemistry Q75

Question 75 of 90 in this shift, Chemistry question 15 of 30, Section A.

For the reaction RCH2Br+I−→AcetoneRCH2Imajor+Br−\mathrm{RCH_2Br + I^-}\xrightarrow{\text{Acetone}}\underset{\text{major}}{\mathrm{RCH_2I}}+\mathrm{Br^-} The correct statement is
  1. (1)The reaction can occur in acetic acid also.
  2. (2)Br−\mathrm{Br^-} can act as competing nucleophile.
  3. (3)The solvent used in the reaction solvates the ions formed in rate determining step.
  4. (4)The transition state formed in the above reaction is less polar than the localised anion.Official answer

Official answer

Option 4

NTA final key.

Chapter
Haloalkanes and Haloarenes
Topic
SN1 and SN2 Mechanisms
Idea tested
Finkelstein Reaction

Same idea in other shifts

Asked 4× in all
  1. 4 Apr 2026, Shift 1 · Q65Match the LIST-I with LIST-II List-I (Name of reaction): A. Finkelstein reaction; B. Swarts reaction; C. Sandmeyer's reaction; D. Fittig…EasyMatch the list
  2. 2 Apr 2025, Shift 2 · Q67Match List - I with List - II. List - I (Reaction) (A)…EasyMatch the listHas a figure
  3. 27 Jul 2022, Shift 1 · Q75[figure: benzene ring (hexagon with inner circle) with CH2OH at the top and OH at the bottom (para)] ++ HCl →Δ\xrightarrow{\Delta} A…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.