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Saturday, 31 October

JEE Main 2022 · ChemistryMultiple choiceDiagram basedMediumMulti-step

JEE Main 28 June 2022, Shift 1, Chemistry Q76

Question 76 of 90 in this shift, Chemistry question 16 of 30, Section A.

Identify the major product formed in the following sequence of reactions : [benzene ring with NH2 substituent] →(2) NaNO2/HCl(3) H3PO2(1) Br2 / H2O\xrightarrow[\substack{(2)\ \mathrm{NaNO_2/HCl}\\(3)\ \mathrm{H_3PO_2}}]{(1)\ \mathrm{Br_2\,/\,H_2O}}

The figure, in words

Stem: benzene ring with NH2 substituent, arrow with conditions (1) Br2/H2O, (2) NaNO2/HCl, (3) H3PO2. Options are benzene rings with substituents as described.
  1. (1)[figure: benzene ring with one Br substituent]
  2. (2)[figure: benzene ring with NH·NH2 substituent at the top and Br at the bottom (opposite positions)]
  3. (3)[figure: benzene ring with three Br substituents at alternate ring positions (upper left, upper right, bottom)]Official answer
  4. (4)[figure: benzene ring with OH at the top and Br at upper left, upper right and bottom]

Official answer

Option 3

NTA final key.

Chapter
Amines
Topic
Diazonium Salts
Idea tested
Deamination Byproducts: Hypophosphorous Acid

Same idea in other shifts

Asked 2× in all
  1. 22 Jul 2021, Shift 2 · Q47In the chemical reactions given above A and B respectively are :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 108 of the 174 JEE Main shifts held from 2017 to 2026.