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Friday, 9 October

JEE Main 2021 · ChemistryMultiple choiceDiagram basedEasyApplication

JEE Main 18 March 2021, Shift 1, Chemistry Q47

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

[figure: aniline --(NaNO2, HCl, 273 K - 278 K)--> "X" (Major Product) --(N,N-dimethylaniline)--> "Y" (Major Product)] Considering the above reaction, X and Y respectively are :

The figure, in words

Reaction scheme of aniline diazotisation then coupling with N,N-dimethylaniline; options are skeletal structures.
  1. (1)C6H5N2+Cl−\mathrm{C_6H_5N_2^+Cl^-} and C6H5−N=N−C6H4−N(CH3)2\mathrm{C_6H_5{-}N{=}N{-}C_6H_4{-}N(CH_3)_2} (azo coupling at the ortho position of dimethylaniline)
  2. (2)C6H5Cl\mathrm{C_6H_5Cl} and C6H5−N=N−C6H4−N(CH3)2\mathrm{C_6H_5{-}N{=}N{-}C_6H_4{-}N(CH_3)_2} (azo coupling at the ortho position of dimethylaniline)
  3. (3)C6H5N2+Cl−\mathrm{C_6H_5N_2^+Cl^-} and C6H5−N=N−C6H4−N(CH3)2\mathrm{C_6H_5{-}N{=}N{-}C_6H_4{-}N(CH_3)_2} (azo coupling at the para position of dimethylaniline)Official answer
  4. (4)C6H5Cl\mathrm{C_6H_5Cl} and C6H5−N=N−C6H4−N(CH3)2\mathrm{C_6H_5{-}N{=}N{-}C_6H_4{-}N(CH_3)_2} (azo coupling at the para position of dimethylaniline)

Official answer

Option 3

NTA final key.

Chapter
Amines
Topic
Diazonium Salts
Idea tested
Regioselectivity in Azo Coupling

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 42 of the 174 JEE Main shifts held from 2017 to 2026.