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Saturday, 31 October

JEE Main 2022 · ChemistryMultiple choiceSingle correctEasyConceptual

JEE Main 25 June 2022, Shift 1, Chemistry Q75

Question 75 of 90 in this shift, Chemistry question 15 of 30, Section A.

The major product in the reaction [figure: CH3−C(CH3)(CH3)−Cl\mathrm{CH_3-C(CH_3)(CH_3)-Cl} (central C with CH3\mathrm{CH_3} above, CH3\mathrm{CH_3} below, CH3\mathrm{CH_3} left, Cl right) + K+ −O−C(CH3)(CH3)−CH3\mathrm{K^+\ ^-O-C(CH_3)(CH_3)-CH_3} (central C with CH3\mathrm{CH_3} above, CH3\mathrm{CH_3} below, CH3\mathrm{CH_3} right) arrow] ? is :

The figure, in words

Reaction drawn: a carbon bearing three CH3\mathrm{CH_3} groups and Cl, plus K+\mathrm{K^+} and O−\mathrm{O^-} attached to a carbon bearing three CH3\mathrm{CH_3} groups, then an arrow and '? is :'.
  1. (1)t-Butyl ethyl ether
  2. (2)2,2-Dimethyl butane
  3. (3)2-Methyl pent-1-ene
  4. (4)2-Methyl prop-1-eneOfficial answer

Official answer

Option 4

NTA final key.

Chapter
Haloalkanes and Haloarenes
Topic
Alkenes and Alkynes
Idea tested
Saytzeff vs. Hofmann Elimination

Same idea in other shifts

Asked 7× in all
  1. 2 Apr 2025, Shift 2 · Q75Consider the above sequence of reactions. 151 g of 2-bromopentane is made to react. Yield of major product P is 80% whereas Q is 100%.…MediumNumerical valueHas a figure
  2. 5 Apr 2024, Shift 2 · Q77Identify the major product in the following reaction. 1-bromo-1-methylcyclopentane…EasyDiagram basedHas a figure
  3. 31 Aug 2021, Shift 2 · Q41The major product of the following reaction is : [reaction: starting material drawn as a five-membered ring; reagent above/below arrow:…MediumDiagram basedHas a figure
  4. 2 Sep 2020, Shift 2 · Q44The major product obtained from E2\mathrm{E_2}-elimination of 3-bromo-2-fluoropentane is :HardSingle correctHas a figure
  5. 2 Apr 2017 (offline) · Q52Which of the following, upon treatment with *tert*-BuONa followed by addition of bromine water, fails to decolourize the colour of bromine ?HardSingle correctHas a figure
  6. 2 Apr 2017 (offline) · Q56The major product obtained in the following reaction is : [reaction: (+)-C6H5CH(Br)CH2C6H5\mathrm{C_6H_5CH(Br)CH_2C_6H_5} (Br on wedge, H on hash at the…MediumSingle correctHas 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.