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Saturday, 31 October

JEE Main 2021 · ChemistryMultiple choiceDiagram basedMediumApplication

JEE Main 31 August 2021, Shift 1, Chemistry Q46

Question 46 of 90 in this shift, Chemistry question 16 of 30, Section A.

The major product formed in the following reaction is :

The figure, in words

Reactant drawn: CH3 — C (CH3 above, CH3 below) — CH (OH below) — CH3; arrow labelled 'conc. H2SO4' over 'a few drops', then 'Major Product'.
  1. (1)[structure as drawn: CH3 — C (with CH3 above and CH3 below) — CH = CH2]
  2. (2)[structure as drawn: C (with CH3 and CH3 on its left) = CH — CH3]
  3. (3)[structure as drawn: skeletal C=C double bond; CH3 up from each double-bond carbon; H3C at lower left and CH3 at lower right]Official answer
  4. (4)[structure as drawn: CH3 — C (with CH3 below) = CH — CH2CH3]

Official answer

Option 3

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. 13 Apr 2023, Shift 1 · Q89For 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…MediumNumerical valueHas a figure
  4. 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
  5. 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
  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.