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Saturday, 31 October

JEE Main 2024 · ChemistryMultiple choiceDiagram basedMediumConceptual

JEE Main 5 April 2024, Shift 2, Chemistry Q76

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

Which one of the following reactions is NOT possible ?

The figure, in words

Each option is a reaction drawn with benzene-ring structures: (1) phenol + HCl gives chlorobenzene; (2) chlorobenzene with NaOH, high temp, H+ gives phenol; (3) anisole with Cl2/AlCl3 gives para-chloroanisole; (4) anisole with HBr gives phenol.
  1. (1)Phenol (C6H5-OH) →HCl\xrightarrow{\mathrm{HCl}} chlorobenzene (C6H5-Cl)Official answer
  2. (2)Chlorobenzene →High Temp, H+NaOH\xrightarrow[\text{High Temp, }\mathrm{H^+}]{\mathrm{NaOH}} phenol
  3. (3)Anisole (C6H5OCH3\mathrm{C_6H_5OCH_3}) →Cl2/AlCl3\xrightarrow{\mathrm{Cl_2/AlCl_3}} 4-chloroanisole (p-ClC6H4OCH3\mathrm{ClC_6H_4OCH_3})
  4. (4)Anisole (C6H5OCH3\mathrm{C_6H_5OCH_3}) →HBr\xrightarrow{\mathrm{HBr}} phenol (C6H5-OH)

Official answer

Option 1

.

Chapter
Alcohols, Phenols and Ethers
Topic
Alcohols and Phenols
Idea tested
Dow Process for Phenol

Same idea in other shifts

Asked 3× in all
  1. 5 Apr 2024, Shift 1 · Q78Identify compound (Z) in the following reaction sequence. chlorobenzene…EasyDiagram 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.