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Saturday, 31 October

JEE Main 2024 · ChemistryNumerical answerNumerical valueEasyApplication

JEE Main 31 January 2024, Shift 1, Chemistry Q88

Question 88 of 90 in this shift, Chemistry question 28 of 30, Section B.

CH3CH2Br+NaOH\mathrm{CH_3CH_2Br + NaOH} with C2H5OH\mathrm{C_2H_5OH} gives Product A, and with H2O\mathrm{H_2O} gives Product B. The total number of hydrogen atoms in product A and product B is _________.

The figure, in words

Reaction scheme: CH3CH2Br + NaOH branches to Product A (solvent C2H5OH, top arrow) and Product B (solvent H2O, bottom arrow)

Official answer

10

NTA final key.

Chapter
Haloalkanes and Haloarenes
Topic
SN1 and SN2 Mechanisms
Idea tested
Temperature Effects on Substitution vs Elimination

Same idea in other shifts

Asked 3× in all
  1. 4 Apr 2024, Shift 2 · Q77→ΔKOH(alc)\xrightarrow[\Delta]{\mathrm{KOH(alc)}} major product "P" Product P isMediumDiagram basedHas a figure
  2. 3 Sep 2020, Shift 2 · Q45The major product in the following reaction is : [figure] →Heatt-BuOH\xrightarrow[\text{Heat}]{\text{t-BuOH}}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.