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Saturday, 31 October

JEE Main 2023 · ChemistryNumerical answerNumerical valueMediumMulti-step

JEE Main 13 April 2023, Shift 1, Chemistry Q89

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

For the given reaction CH3−C(CH3)(CH3)−CH(OH)−C(H)(CH3)−CH3→ΔH+\mathrm{CH_3-C(CH_3)(CH_3)-CH(OH)-C(H)(CH_3)-CH_3}\xrightarrow[\Delta]{H^+} (the carbon bearing OH is labelled 'A') The total number of possible products formed by tertiary carbocation of A is ___________.

The figure, in words

Structure drawn: CH3-C(CH3)(H3C)-CH(OH)-C(H)(CH3)-CH3, i.e. a quaternary carbon (three CH3 groups) bonded to CH(OH) which is bonded to CH(CH3)2; the CH(OH) carbon is labelled 'A'; reagent H+, heat.

Official answer

5

NTA final key.

Chapter
Alcohols, Phenols and Ethers
Topic
Alcohols and Phenols
Idea tested
Alcohol Dehydration Ease

Same idea in other shifts

Asked 7× in all
  1. 5 Apr 2026, Shift 1 · Q67Consider compounds A, B and C with following structural formulae A = CH3−CH2−CH2−CH2−CH2−OH\mathrm{CH_3-CH_2-CH_2-CH_2-CH_2-OH} B =…EasyOtherHas a figure
  2. 8 Apr 2024, Shift 1 · Q78Identify the major products A and B respectively in the following set of reactions. [figure: 1-methylcyclohexan-1-ol (ring carbon bearing…MediumDiagram basedHas a figure
  3. 29 Jul 2022, Shift 2 · Q76When enthanol is heated with conc. H2SO4\mathrm{H_2SO_4}, a gas is produced. The compound formed, when this gas is treated with cold dilute…EasySingle correct
  4. 4 Aug 2021, Shift 2 · Q41In the reaction given below, [reaction scheme: drawn structure → A + B, see figure_note] the products A and B formed areMediumDiagram basedHas a figure
  5. 31 Aug 2021, Shift 1 · Q46The major product formed in the following reaction is :MediumDiagram basedHas a figure
  6. 4 Sep 2020, Shift 1 · Q44When neopentyl alcohol is heated with an acid, it slowly converted into an 85 : 15 mixture of alkenes A and B, respectively. What are…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.