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Saturday, 31 October

JEE Main 2026 · ChemistryMultiple choiceOtherEasyApplication

JEE Main 5 April 2026, Shift 1, Chemistry Q67

Question 67 of 75 in this shift, Chemistry question 17 of 25, Section A.

Consider 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 = CH2=CH−CH2−CH2−CH3\mathrm{CH_2=CH-CH_2-CH_2-CH_3} C = HO−CH2−CH2−CH(OH)−CH3\mathrm{HO-CH_2-CH_2-CH(OH)-CH_3} For the conversion of B from A, reagent (D) required is ________ and structural formula of product (E) obtained when C undergoes same reaction using excess reagent (D) is ________.

The figure, in words

Each option is a two-column table with headings D (reagent) and E (product structure).
  1. (1)D: Conc. H2SO4\mathrm{H_2SO_4}; E: CH2=CH−CH(OH)CH3\mathrm{CH_2=CH-CH(OH)CH_3}
  2. (2)D: PCC; E: HO−CH2−CH2−CH=CH2\mathrm{HO-CH_2-CH_2-CH=CH_2}
  3. (3)D: PCC; E: CH2=CH−CH=CH2\mathrm{CH_2=CH-CH=CH_2}
  4. (4)D: Conc. H2SO4\mathrm{H_2SO_4} or H3PO4\mathrm{H_3PO_4}; E: CH2=CH−CH=CH2\mathrm{CH_2=CH-CH=CH_2}Official answer

Official answer

Option 4

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. 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
  2. 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
  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.