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Saturday, 31 October

JEE Main 2025 · ChemistryMultiple choiceDiagram basedEasyMulti-step

JEE Main 3 April 2025, Shift 1, Chemistry Q66

Question 66 of 75 in this shift, Chemistry question 16 of 25, Section A.

Identify [A], [B] and [C], respectively in the following reaction sequence: [A] --(NaNO2_2, HCl, 273 - 278 K)--> benzenediazonium chloride (C6H5N2+Cl−\mathrm{C_6H_5N_2^{+}Cl^{-}}) --(KI)--> [B] --(2Na, Dry ether)--> [C]

The figure, in words

Reaction scheme: [A] treated with NaNO2/HCl at 273-278 K gives benzenediazonium chloride, which with KI gives [B], which with 2Na in dry ether gives [C].
  1. (1)[figure: [A] aniline, [B] chlorobenzene, [C] benzene]
  2. (2)[figure: [A] aniline, [B] chlorobenzene, [C] iodobenzene]
  3. (3)[figure: [A] nitrobenzene, [B] iodobenzene, [C] biphenyl]
  4. (4)[figure: [A] aniline, [B] iodobenzene, [C] biphenyl]Official answer

Official answer

Option 4

NTA final key.

Chapter
Amines
Topic
Diazonium Salts
Idea tested
Synthesis of Iodobenzene

Same idea in other shifts

Asked 2× in all
  1. 26 Jul 2022, Shift 2 · Q77The correct sequential order of the reagents for the given reaction is [figure: benzene ring with NO2\mathrm{NO_2} at the top and…HardSingle 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.