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Friday, 9 October

JEE Main 2026 · ChemistryMultiple choiceDiagram basedMediumApplication

JEE Main 8 April 2026, Shift 2, Chemistry Q63

Question 63 of 75 in this shift, Chemistry question 13 of 25, Section A.

The major product of which of the following reaction is not obtained by rearrangement reaction ?

The figure, in words

Each option is a reaction scheme with skeletal structures; see option text.
  1. (1)[figure: benzene + 1-chloropropane (CH3CH2CH2Cl) with anhyd. AlCl3 gives isopropylbenzene (cumene)]
  2. (2)[figure: tert-butyl alcohol (2-methylpropan-2-ol) with H3O+ gives isobutene (2-methylpropene)]Official answer
  3. (3)CH3(CH2)4CH3\mathrm{CH_3(CH_2)_4CH_3} with anhyd. AlCl3\mathrm{AlCl_3} / HCl gives CH3−CH(CH3)(CH2)2CH3\mathrm{CH_3{-}CH(CH_3)(CH_2)_2CH_3} (CH(CH3) branch drawn below, CH2CH2CH3 chain)
  4. (4)[figure: neopentyl alcohol (2,2-dimethylpropan-1-ol, skeletal) with H3O+ gives 2-methylbut-2-ene]

Official answer

Option 2

NTA final key.

Chapter
Haloalkanes and Haloarenes
Topic
SN1 and SN2 Mechanisms
Idea tested
Carbocation Rearrangements in SN1

Same idea in other shifts

Asked 2× in all
  1. 6 Apr 2024, Shift 2 · Q76Chemical reaction: (1-chloropropyl)cyclohexane [cyclohexyl ring attached to CHCl-CH2-CH3] ++ NaOH →H2O\xrightarrow{\mathrm{H_2O}} Major…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 42 of the 174 JEE Main shifts held from 2017 to 2026.