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Saturday, 31 October

JEE Main 2022 · ChemistryMultiple choiceSingle correctMediumApplication

JEE Main 26 June 2022, Shift 2, Chemistry Q78

Question 78 of 90 in this shift, Chemistry question 18 of 30, Section A.

The final product 'C' in the following series of reactions [drawn benzene ring with NO2] --Sn/HCl--> A --NaNO2\mathrm{NaNO_2}, HCl--> B --β\beta-Naphthol, NaOH--> C is

The figure, in words

Stem: benzene ring with NO2, then reaction arrows labelled Sn/HCl, NaNO2 / HCl, beta-Naphthol / NaOH leading to A, B, C. Options are drawn azo compounds (benzene ring - N=N - fused two-ring system carrying an OH) differing in the position of OH and of the N=N attachment.
  1. (1)[drawn benzene ring joined by N=N to a drawn two-ring fused system, with OH at the lower right of the fused system]
  2. (2)[drawn two-ring fused system with OH at the top right, joined by N=N at the bottom left to a drawn benzene ring]
  3. (3)[drawn benzene ring joined by N=N to a drawn two-ring fused system, with HO at the top of the fused system next to the N=N attachment]Official answer
  4. (4)[drawn benzene ring joined by N=N to a drawn two-ring fused system, with OH at the top right of the fused system]

Official answer

Option 3

NTA final key.

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

Same idea in other shifts

Asked 2× in all
  1. 9 Jan 2020, Shift 2 · Q45Consider 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…MediumSingle 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.