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Friday, 9 October

JEE Main 2024 · ChemistryNumerical answerNumerical valueMediumMulti-step

JEE Main 6 April 2024, Shift 2, Chemistry Q89

Question 89 of 90 in this shift, Chemistry question 29 of 30, Section B.

Reaction: ethoxybenzene (benzene ring with OC2H5\mathrm{OC_2H_5}) →HNO3, H2SO4\xrightarrow{\mathrm{HNO_3,\ H_2SO_4}} P (major product) →2Br2, Fe\xrightarrow{\mathrm{2Br_2,\ Fe}} Q (major product) The ratio of number of oxygen atoms to bromine atoms in the product Q is ________ ×10−1\times 10^{-1}.

The figure, in words

Benzene ring bearing OC2H5, treated with HNO3/H2SO4 to give major product P, then 2Br2/Fe to give major product Q.

Official answer

15

NTA final key.

Chapter
Haloalkanes and Haloarenes
Topic
Aromatic Hydrocarbons
Idea tested
Synergic Directing Effects in Di-substituted Benzenes

Same idea in other shifts

Asked 3× in all
  1. 3 Apr 2025, Shift 2 · Q67In the following series of reactions identify the major products A & B respectively Bromobenzene…MediumDiagram basedHas a figure
  2. 6 Apr 2024, Shift 2 · Q79The major products formed : Anisole (benzene ring with OCH3\mathrm{OCH_3}) →HNO3, H2SO4\xrightarrow{\mathrm{HNO_3,\ H_2SO_4}} 'A'…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 42 of the 174 JEE Main shifts held from 2017 to 2026.