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Saturday, 31 October

JEE Main · Chemistry · Amines

Azo Coupling Reactions

JEE Main asked Azo Coupling Reactions 11 times in 11 of the 108 shifts Lumi analysed, in 2021, 2022, 2023, 2024 and 2025. It belongs to Diazonium Salts, in Amines (Chemistry). The longest wait between two years asking it was 1 year. In 2021 and 2024 it came in more than one shift of the same year.

Updated 2026-10-24

Times asked
11
in 11 shifts
Years
5 of 8
First asked
2021
last in 2025
Pattern
Asked most years
across the analysed shifts

Questions on this idea a shift, by year

2017–2026. Asked in 2021, 2022, 2023, 2024 and 2025. Years differ in how many shifts Lumi analysed, so each year is scaled to one shift of 25 Chemistry questions.

00.10.20’170’200.14’210.03’220.07’230.19’240.13’250’26

Raw count: 2017: 0 in 1 shift · 2020: 0 in 12 shifts · 2021: 4 in 24 shifts · 2022: 1 in 24 shifts · 2023: 1 in 12 shifts · 2024: 4 in 18 shifts · 2025: 1 in 8 shifts · 2026: 0 in 9 shifts.

Shift by shift

Each square is one analysed shift, in date order. Open a filled one for that paper.

  • 20260 of 9
  • 20251 of 8
  • 20244 of 18
  • 20231 of 12
  • 20221 of 24
  • 20214 of 24
  • 20200 of 12
  • 20170 of 1

Asked in that shift More than once Not asked

How JEE Main framed it

Diagram based is the usual form. Skill tested: multi-step.

  • Predict product of reaction sequence
  • Mass of azo dye product

Difficulty

Easy 5Medium 6Hard 0

1 of the 11 questions had a numerical answer.

Every question

All 11 questions

From the official JEE Main shift papers, newest first. Open one for the full question, the options and the official answer.

  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. 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
  3. 30 Jan 2024, Shift 2 · Q79The products A and B formed in the following reaction scheme are respectively Benzene…EasyDiagram basedHas a figure
  4. 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
  5. 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
  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. 25 Jul 2021, Shift 2 · Q47[reaction scheme] C6H5NO2\mathrm{C_6H_5NO_2} with reagent Sn + HCl gives "A"; "A" with reagent…MediumDiagram basedHas a figure
  9. 25 Feb 2021, Shift 1 · Q48Which of the following reaction/s will not give pp-aminoazobenzene ? A - [benzene ring with NO2\mathrm{NO_2}]…MediumSingle correctHas a figure
  10. 24 Feb 2021, Shift 2 · Q42The diazonium salt of which of the following compounds will form a coloured dye on reaction with β\beta-Naphthol in NaOH ?EasySingle correctHas a figure
  11. 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

Shifts: 24 Feb 2021, Shift 2, 25 Feb 2021, Shift 1, 25 Jul 2021, Shift 2, 3 Aug 2021, Shift 1, 29 Jul 2022, Shift 1, 15 Apr 2023, Shift 1, 30 Jan 2024, Shift 2, 30 Jan 2024, Shift 1, 31 Jan 2024, Shift 2, 6 Apr 2024, Shift 1, 2 Apr 2025, Shift 2.

Same topic

Other ideas in Diazonium Salts

Diazonium Salts has 16 ideas JEE Main has asked; 8 of them came up in more than one question. The 12 most asked are below.

Topic analysisChapter analysisStudy this chapterAll repeated ideas