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Saturday, 31 October

JEE Main 2023 · ChemistryMultiple choiceDiagram basedEasyApplication

JEE Main 15 April 2023, Shift 1, Chemistry Q77

Question 77 of 90 in this shift, Chemistry question 17 of 30, Section A.

Consider the following sequence of reactions: [figure: aniline (C6H5NH2\mathrm{C_6H_5NH_2}) →NaNO2, 0-5∘C\xrightarrow{\mathrm{NaNO_2},\ 0\text{-}5^\circ\mathrm{C}} 'A' →N, N-Dimethylaniline\xrightarrow{\text{N, N-Dimethylaniline}} 'B'] The product 'B' is

The figure, in words

Scheme: aniline with NaNO2 at 0-5 C gives A, then N,N-dimethylaniline gives B; options are structures with two benzene rings joined through N-N linkages or directly.
  1. (1)[figure: C6H5−N(CH3)−N(CH3)−C6H4−NH2\mathrm{C_6H_5-N(CH_3)-N(CH_3)-C_6H_4-NH_2} (para), i.e. phenyl-N(CH3)-N(CH3)-C6H4-NH2]
  2. (2)[figure: C6H5−NH−NH−C6H4−N(CH3)2\mathrm{C_6H_5-NH-NH-C_6H_4-N(CH_3)_2} (para)]
  3. (3)[figure: C6H5−N=N−C6H4−N(CH3)2\mathrm{C_6H_5-N=N-C_6H_4-N(CH_3)_2} (para)]Official answer
  4. (4)[figure: H2NHN−C6H4−C6H4−N(CH3)2\mathrm{H_2NHN-C_6H_4-C_6H_4-N(CH_3)_2} (para, para; biphenyl skeleton)]

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. 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.