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Saturday, 31 October

JEE Main 2024 · ChemistryMultiple choiceDiagram basedEasyMulti-step

JEE Main 5 April 2024, Shift 1, Chemistry Q78

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

Identify compound (Z) in the following reaction sequence. chlorobenzene +NaOH→300 atm623 KX→HClY→Conc. HNO3Z+ \mathrm{NaOH} \xrightarrow[\text{300 atm}]{\text{623 K}} X \xrightarrow{\mathrm{HCl}} Y \xrightarrow{\text{Conc. } \mathrm{HNO_3}} Z

The figure, in words

Chlorobenzene (Cl on benzene ring) + NaOH at 623 K, 300 atm gives X, then HCl gives Y, then conc. HNO3 gives Z. Options are four substituted phenol structures.
  1. (1)[figure: 2,4-dinitrophenol (OH at top, NO2 ortho and NO2 para to OH)]
  2. (2)[figure: 2-nitrophenol (OH with NO2 at the ortho position)]
  3. (3)[figure: 4-nitrophenol (OH with NO2 para to it)]
  4. (4)[figure: 2,4,6-trinitrophenol (picric acid; OH with NO2 at both ortho positions and para)]Official answer

Official answer

Option 4

.

Chapter
Haloalkanes and Haloarenes
Topic
Alcohols and Phenols
Idea tested
Dow Process for Phenol

Same idea in other shifts

Asked 3× in all
  1. 5 Apr 2024, Shift 2 · Q76Which one of the following reactions is NOT possible ?MediumDiagram basedHas a figure
  2. 17 Mar 2021, Shift 1 · Q44[reaction drawn: see figure_note] The above reaction requires which of the following reaction conditions ?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.