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Saturday, 31 October

JEE Main 2022 · ChemistryMultiple choiceDiagram basedEasyConceptual

JEE Main 25 June 2022, Shift 1, Chemistry Q76

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

The intermediate X, in the reaction : [figure: CHCl3\mathrm{CHCl_3} + Aq. NaOH + benzene ring with OH substituent, arrow to [X]; below [X] an arrow labelled (1) NaOH (2) H+\mathrm{H^+} to a benzene ring with OH and CHO on adjacent ring carbons] is:

The figure, in words

Reaction scheme: CHCl3\mathrm{CHCl_3} + Aq. NaOH + a benzene ring bearing OH, arrow to [X]; [X] arrow down labelled (1) NaOH, (2) H+\mathrm{H^+}, to a benzene ring bearing OH and CHO on adjacent ring carbons. Options are benzene-ring drawings.
  1. (1)[figure: benzene ring with OH at top and CCl3\mathrm{CCl_3} on the neighbouring ring carbon]
  2. (2)[figure: benzene ring with OH at top and CHCl2\mathrm{CHCl_2} on the neighbouring ring carbon]
  3. (3)[figure: benzene ring with O−Na+\mathrm{O^-Na^+} at top and CHCl2\mathrm{CHCl_2} on the neighbouring ring carbon]Official answer
  4. (4)[figure: benzene ring with O−Na+\mathrm{O^-Na^+} at top and CCl3\mathrm{CCl_3} on the neighbouring ring carbon]

Official answer

Option 3

NTA final key.

Chapter
Alcohols, Phenols and Ethers
Topic
Alcohols and Phenols
Idea tested
Reimer-Tiemann Reaction

Same idea in other shifts

Asked 9× in all
  1. 6 Apr 2024, Shift 1 · Q78In Reimer - Tiemann reaction, phenol is converted into salicylaldehyde through an intermediate. The structure of intermediate is __________.EasyDiagram basedHas a figure
  2. 8 Apr 2024, Shift 2 · Q77Match List - I with List - II. List - I (Reactions) | List - II (Products) (A) aniline (C6H5NH2\mathrm{C_6H_5NH_2}) with (i)…MediumMatch the listHas a figure
  3. 30 Jan 2024, Shift 2 · Q76Salicylaldehyde is synthesized from phenol, when reacted withEasySingle correct
  4. 27 Jun 2022, Shift 2 · Q75Match List I with List II. List I | List II A. [drawn: benzene ring bearing OH →\rightarrow benzene ring bearing OH and, on a…MediumMatch the listHas a figure
  5. 4 Aug 2021, Shift 1 · Q46Match List I with List II List I List II A. Kolbe's Reaction I. [structure: benzene ring with a CHO substituent] B. Gatterman-Koch…MediumMatch the listHas a figure
  6. 26 Feb 2021, Shift 1 · Q45Identify the major products A and B respectively in the following reactions of phenol : [reaction scheme, see figure_note]MediumDiagram basedHas a figure
  7. 22 Jul 2021, Shift 2 · Q45An organic compound A (C6H6O\mathrm{C_6H_6O}) gives dark green colouration with ferric chloride. On treatment with CHCl3\mathrm{CHCl_3} and KOH,…MediumDiagram basedHas a figure
  8. 6 Sep 2020, Shift 2 · Q50A solution of phenol in chloroform when treated with aqueous NaOH gives compound P as a major product. The mass percentage of carbon in P…EasyNumerical value

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.