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Saturday, 31 October

JEE Main 2023 · ChemistryMultiple choiceDiagram basedMediumConceptual

JEE Main 15 April 2023, Shift 1, Chemistry Q72

Question 72 of 90 in this shift, Chemistry question 12 of 30, Section A.

[figure: ninhydrin (benzene ring fused to a five-membered ring bearing three C=O groups) →H2O\xrightarrow{\mathrm{H_2O}} 'A' major product] 'A' formed in the above reaction is

The figure, in words

Reactant is ninhydrin (1,2,3-indanetrione, benzene fused to a five-membered ring with three carbonyls) with H2O; options are indane-based structures with OH/C=O groups at C1, C2, C3.
  1. (1)[figure: indane ring with OH on C1, OH on C2 and C=O on C3]
  2. (2)[figure: indane ring with OH on C1, C=O on C2 and OH on C3]
  3. (3)[figure: indane ring with geminal diol (two OH) on C1, C=O on C2 and C=O on C3]
  4. (4)[figure: indane ring with C=O on C1, geminal diol (two OH) on C2 and C=O on C3]Official answer

Official answer

Option 4

NTA final key.

Chapter
Aldehydes, Ketones and Carboxylic Acids
Topic
Nucleophilic Addition
Idea tested
Stability of Chloral Hydrate

Same topic in other shifts

All Nucleophilic Addition questions
  1. 2 Apr 2026, Shift 2 · Q67A molecule (X) with following structure under mild acidic condition is hydrolysed to produce (Y) and (Z). Identify the correct statements…MediumSingle correct
  2. 5 Apr 2026, Shift 2 · Q66Given below are two statements : Statement I : The condensation reaction between CH3−CH=O\mathrm{CH_3-CH=O} and H2N−NH−C(=O)−NH2\mathrm{H_2N-NH-C(=O)-NH_2}…MediumTwo statements
  3. 7 Apr 2025, Shift 2 · Q68"P" is an optically active compound with molecular formula C6H12O\mathrm{C_6H_{12}O}. When 'P' is treated with 2, 4-dinitrophenylhydrazine, it…MediumDiagram basedHas a figure
  4. 6 Apr 2024, Shift 1 · Q79Which among the following aldehydes is most reactive towards nucleophilic addition reactions?EasySingle correctHas a figure
  5. 6 Apr 2024, Shift 2 · Q78Consider the given reaction, identify the major product P. CH3−COOH\mathrm{CH_3-COOH}…MediumSingle correct
  6. 30 Jan 2024, Shift 1 · Q90The compound formed by the reaction of ethanal with semicarbazide contains ________ number of nitrogen atoms.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.