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Saturday, 31 October

JEE Main 2024 · ChemistryMultiple choiceDiagram basedEasyMulti-step

JEE Main 30 January 2024, Shift 2, Chemistry Q79

Question 79 of 90 in this shift, Chemistry question 19 of 30, Section A.

The products A and B formed in the following reaction scheme are respectively Benzene →ii) Sn / HCli) con. HNO3/Con. H2SO4, 323–333 K\xrightarrow[\text{ii) Sn / HCl}]{\text{i) con. }\mathrm{HNO_3}/\text{Con. }\mathrm{H_2SO_4},\ 323\text{--}333\ \mathrm{K}} A →ii) Phenoli) NaNO2, HCl, 273–278 K\xrightarrow[\text{ii) Phenol}]{\text{i) }\mathrm{NaNO_2},\ \mathrm{HCl},\ 273\text{--}278\ \mathrm{K}} B

The figure, in words

Reaction scheme: benzene, (i) conc. HNO3/conc. H2SO4 at 323-333 K, (ii) Sn/HCl gives A; then (i) NaNO2, HCl at 273-278 K, (ii) phenol gives B. Options are structure pairs (A, B).
  1. (1)[figure: A = aniline; B = 2-amino-4'-hydroxybiphenyl (biphenyl with NH2 ortho on one ring and OH para on the other ring)]
  2. (2)[figure: A = 3-chloronitrobenzene; B = 4-hydroxy-3'-nitrobiphenyl]
  3. (3)[figure: A = aniline; B = 4-hydroxyazobenzene, HO-C6H4-N=N-C6H5 (para)]Official answer
  4. (4)[figure: A = aniline; B = 2-hydroxyazobenzene, ortho-HO-C6H4-N=N-C6H5]

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. 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
  5. 15 Apr 2023, Shift 1 · Q77Consider the following sequence of reactions: [figure: aniline (C6H5NH2\mathrm{C_6H_5NH_2})…EasyDiagram basedHas a figure
  6. 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
  7. 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
  8. 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

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.