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Friday, 9 October

JEE Main 2023 · ChemistryMultiple choiceSingle correctMediumMulti-step

JEE Main 13 April 2023, Shift 2, Chemistry Q78

Question 78 of 90 in this shift, Chemistry question 18 of 30, Section A.

Compound A from the following reaction sequence is: A →0−5∘CBr2, CS2\xrightarrow[0-5^\circ\mathrm{C}]{\mathrm{Br_2,\ CS_2}} B →NaNO2/HCl\xrightarrow{\mathrm{NaNO_2/HCl}} C →ΔH3PO2\xrightarrow[\Delta]{\mathrm{H_3PO_2}} 1,3,5-tribromobenzene

The figure, in words

Final product drawn is a benzene ring with three Br atoms at the 1,3,5 positions (1,3,5-tribromobenzene).
  1. (1)Benzoic Acid
  2. (2)Salicylic Acid
  3. (3)Phenol
  4. (4)AnilineOfficial answer

Official answer

Option 4

NTA final key.

Chapter
Amines
Topic
Diazonium Salts
Idea tested
Replacement by H or OH

Same idea in other shifts

Asked 4× in all
  1. 2 Apr 2026, Shift 2 · Q68Identify compounds A and E in the following reaction sequence.…MediumSingle correctHas a figure
  2. 8 Apr 2023, Shift 2 · Q76The product (P) formed from the following multistep reaction is: [reaction: 4-nitrotoluene (benzene ring with NO2\mathrm{NO_2} and…MediumDiagram basedHas a figure
  3. 3 Aug 2021, Shift 2 · Q47A. →2) Heat1) NaNO2(aq.), HCl\xrightarrow[\text{2) Heat}]{\text{1) }\mathrm{NaNO_{2(aq.)}},\ \mathrm{HCl}} B.…EasySingle 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 42 of the 174 JEE Main shifts held from 2017 to 2026.