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Friday, 9 October

JEE Main 2020 · ChemistryMultiple choiceSingle correctMediumMulti-step

JEE Main 9 January 2020, Shift 2, Chemistry Q45

Question 45 of 75 in this shift, Chemistry question 20 of 25, Section A.

Consider the following reactions, [P] →(i) NaNO2/HCl, 0-5 °C; (ii) β-naphthol/NaOH\xrightarrow{\text{(i) NaNO}_2\text{/HCl, 0-5 °C; (ii) }\beta\text{-naphthol/NaOH}} Colored Solid [P] →Br2/H2O\xrightarrow{Br_2/H_2O} C7H6NBr3\mathrm{C_7H_6NBr_3} The compound [P] is :

The figure, in words

Scheme: compound [P] gives a coloured solid with NaNO2/HCl then beta-naphthol/NaOH, and gives C7H6NBr3 with Br2/H2O. Options are substituted benzenes with NH2/NHCH3 and CH3 groups.
  1. (1)[figure: o-toluidine (2-methylaniline)]
  2. (2)[figure: m-toluidine (3-methylaniline)]Official answer
  3. (3)[figure: p-toluidine (4-methylaniline)]
  4. (4)[figure: N-methyl-3-methylaniline (NHCH3 and CH3 meta on benzene ring)]

Official answer

Option 2

NTA final key (Jan 2020).

Chapter
Amines
Topic
Diazonium Salts
Idea tested
Coupling with Beta-Naphthol

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.