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Friday, 9 October

JEE Main 2025 · ChemistryMultiple choiceSingle correctHardMulti-step

JEE Main 4 April 2025, Shift 2, Chemistry Q68

Question 68 of 75 in this shift, Chemistry question 18 of 25, Section A.

A toxic compound "A" when reacted with NaCN in aqueous acidic medium yields an edible cooking component and food preservative "B". "B" is converted to "C" by diborane and can be used as an additive to petrol to reduce emission. "C" upon reaction with oleum at 140∘140^\circC yields an inhalable anesthetic "D". Identify "A", "B", "C" & "D", respectively :
  1. (1)Methanol; formaldehyde; methyl chloride; chloroform
  2. (2)Ethanol; acetonitrile; ethylamine; ethylene
  3. (3)Acetaldehyde; 2-hydroxypropanoic acid; propanoic acid; dipropyl ether
  4. (4)Methanol; acetic acid; ethanol; diethyl etherOfficial answer

Official answer

Option 4

NTA final key.

Chapter
Alcohols, Phenols and Ethers
Topic
Ethers
Idea tested
Temperature Dependence in Alcohol Dehydration

Same topic in other shifts

All Ethers questions
  1. 6 Apr 2026, Shift 2 · Q66Consider the following reaction. [figure: benzyl phenyl ether, C6H5−O−CH2−C6H5\mathrm{C_6H_5{-}O{-}CH_2{-}C_6H_5}] ++ HI →\rightarrow Product…EasyTwo statementsHas a figure
  2. 8 Apr 2025, Shift 2 · Q67Which one of the following reactions will not lead to the desired ether formation in major proportion ? (iso-Bu ⇒ isobutyl, sec-Bu ⇒…MediumSingle correctHas a figure
  3. 29 Jan 2024, Shift 1 · Q77The major product (P) in the following reaction isMediumDiagram basedHas a figure
  4. 2 Sep 2020, Shift 1 · Q43The major aromatic product C in the following reaction sequence will be : 2-methyl-2H-chromene (benzene ring fused to a pyran ring with O,…HardDiagram 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 42 of the 174 JEE Main shifts held from 2017 to 2026.