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Saturday, 31 October

JEE Main 2021 · ChemistryMultiple choiceDiagram basedMediumApplication

JEE Main 24 February 2021, Shift 1, Chemistry Q47

Question 47 of 90 in this shift, Chemistry question 17 of 30, Section A.

‘A’ and ‘B’ in the following reactions are : [figure] →KCNNaNO2/HCl\xrightarrow[\mathrm{KCN}]{\mathrm{NaNO_2/HCl}} (A) →SnCl2/HCl/H3O+\xrightarrow{\mathrm{SnCl_2/HCl/H_3O^+}} (B)

The figure, in words

Stem structure: benzene ring bearing NH2; first arrow labelled NaNO2/HCl (above) and KCN (below) to (A); second arrow labelled SnCl2/HCl/H3O+ to (B).
  1. (1)(A) : [figure: benzene ring bearing N2+Cl− (+ above N, − above Cl)] (B) : [figure: benzene ring bearing Cl]
  2. (2)(A) : [figure: benzene ring bearing N2+Cl− (+ above N, − above Cl)] (B) : [figure: benzene ring bearing CHO]
  3. (3)(A) : [figure: benzene ring bearing CN] (B) : [figure: benzene ring bearing Cl]
  4. (4)(A) : [figure: benzene ring bearing CN] (B) : [figure: benzene ring bearing CHO]Official answer

Official answer

Option 4

NTA final key.

Chapter
Amines
Topic
Diazonium Salts
Idea tested
Cyanide Replacement via Sandmeyer

Same topic in other shifts

All Diazonium Salts questions
  1. 2 Apr 2026, Shift 2 · Q68Identify compounds A and E in the following reaction sequence.…MediumSingle correctHas a figure
  2. 4 Apr 2026, Shift 1 · Q67Product C of the following reaction sequence will be aniline →Br2/water\xrightarrow{\mathrm{Br_2/water}} A (Major Product)…MediumDiagram basedHas a figure
  3. 6 Apr 2026, Shift 1 · Q72Consider the following sequence of reactions. [C6H5−N=N−NH−C6H5\mathrm{C_6H_5-N=N-NH-C_6H_5}]…MediumNumerical valueHas a figure
  4. 6 Apr 2026, Shift 2 · Q67Consider the following organic reaction sequence. Choose the final product (X) from the following (consider the major product in all…HardSingle correctHas a figure
  5. 2 Apr 2025, Shift 2 · Q69When a concentrated solution of sulphanilic acid and 1-naphthylamine is treated with nitrous acid (273 K) and acidified with acetic acid,…MediumSingle correct
  6. 3 Apr 2025, Shift 1 · Q66Identify [A], [B] and [C], respectively in the following reaction sequence: [A] --(NaNO2_2, HCl, 273 - 278 K)--> benzenediazonium…EasyDiagram 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.