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Saturday, 31 October

JEE Main 2021 · ChemistryMultiple choiceSingle correctMediumMulti-step

JEE Main 25 February 2021, Shift 1, Chemistry Q48

Question 48 of 90 in this shift, Chemistry question 18 of 30, Section A.

Which of the following reaction/s will not give pp-aminoazobenzene ? A - [benzene ring with NO2\mathrm{NO_2}] →iii) Anilinei) Sn/HCl, ii) HNO2\xrightarrow[\mathrm{iii)\ Aniline}]{\mathrm{i)\ Sn/HCl,\ ii)\ HNO_2}} B - [benzene ring with NO2\mathrm{NO_2}] →iii) Anilinei) NaBH4, ii) NaOH\xrightarrow[\mathrm{iii)\ Aniline}]{\mathrm{i)\ NaBH_4,\ ii)\ NaOH}} C - [benzene ring with NH2\mathrm{NH_2}] →ii) Aniline, HCli) HNO2\xrightarrow[\mathrm{ii)\ Aniline,\ HCl}]{\mathrm{i)\ HNO_2}}

The figure, in words

Three reaction schemes A, B, C, each starting from a benzene ring with a single substituent at the top: NO2 (A), NO2 (B), NH2 (C). Reagents are listed as printed in the three steps (A: i) Sn/HCl ii) HNO2 iii) Aniline; B: i) NaBH4 ii) NaOH iii) Aniline; C: i) HNO2 ii) Aniline, HCl).
  1. (1)A only
  2. (2)C only
  3. (3)B onlyOfficial answer
  4. (4)A and B

Official answer

Option 3

NTA final key.

Chapter
Amines
Topic
Diazonium Salts
Idea tested
Azo Coupling Reactions

Same idea in other shifts

Asked 11× in all
  1. 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
  2. 6 Apr 2024, Shift 1 · Q909.3 g of pure aniline upon diazotisation followed by coupling with phenol gives an orange dye. The mass of orange dye produced (assume…MediumNumerical value
  3. 30 Jan 2024, Shift 1 · Q80Following is a confirmatory test for aromatic primary amines. Identify reagent (A) and (B). [Scheme: aniline (C6H5NH2\mathrm{C_6H_5NH_2})…EasyDiagram basedHas a figure
  4. 30 Jan 2024, Shift 2 · Q79The products A and B formed in the following reaction scheme are respectively Benzene…EasyDiagram basedHas a figure
  5. 31 Jan 2024, Shift 2 · Q80The azo-dye (Y) formed in the following reactions is Sulphanilic acid + NaNO2\mathrm{NaNO_2} + CH3COOH\mathrm{CH_3COOH} →\rightarrow X. X +…MediumDiagram basedHas a figure
  6. 15 Apr 2023, Shift 1 · Q77Consider the following sequence of reactions: [figure: aniline (C6H5NH2\mathrm{C_6H_5NH_2})…EasyDiagram basedHas a figure
  7. 29 Jul 2022, Shift 1 · Q77[figure: benzenediazonium chloride (benzene ring bearing N+≡NCl−\mathrm{N^{+}\equiv NCl^{-}}) + 'A' →NaOH\xrightarrow{\mathrm{NaOH}} Product…EasyDiagram basedHas a figure
  8. 3 Aug 2021, Shift 1 · Q46Sulphanilic acid on diazotisation and then reaction with N,N–dimethylaniline gives which of the following? Mark if their common name is…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.