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Saturday, 31 October

JEE Main 2022 · ChemistryMultiple choiceDiagram basedMediumApplication

JEE Main 30 June 2022, Shift 1, Chemistry Q76

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

Which among the following will be the major product of the given reaction ? [structure: skeletal chain: a terminal bond to a C=O carbon (O drawn above), two CH2, a second C=O carbon (O drawn below), two CH2, then CO2H] →(ii) H3O+(i) 10% KOH\xrightarrow[\text{(ii) } \mathrm{H_3O^+}]{\text{(i) 10\% KOH}}

The figure, in words

Reactant is a drawn skeletal chain; reagents (i) 10% KOH (ii) H3O+.
  1. (1)[figure: five-membered ring with C=O at one carbon and a C=C double bond on the ring between the upper-right and lower-right carbons; the lower-right carbon carries a chain of two carbons ending in CO2H]
  2. (2)[figure: five-membered ring with C=O at one carbon and a C=C double bond on the ring between the upper-right and lower-right carbons; the upper-right carbon carries one carbon then CO2H; the lower-right carbon carries a single-bond line substituent (methyl)]Official answer
  3. (3)[figure: six-membered ring with C=O at the top carbon and a C=C double bond between the lower-right and bottom ring carbons; the lower-right carbon carries CO2H directly; the bottom carbon carries a single-bond line substituent (methyl)]
  4. (4)[figure: spiro structure: five-membered carbocycle with C=O, sharing one carbon with a five-membered ring containing a ring O and a C=O (lactone-type ring), the spiro carbon bonded to the ring O]

Official answer

Option 2

NTA final key.

Chapter
Aldehydes, Ketones and Carboxylic Acids
Topic
Aldol and Cannizzaro
Idea tested
Intramolecular Aldol

Same idea in other shifts

Asked 5× in all
  1. 8 Apr 2025, Shift 2 · Q68When [structure: CH3C(=O)CH2CH2CH2CH2CHO\mathrm{CH_3C(=O)CH_2CH_2CH_2CH_2CHO}, a skeletal zigzag chain with a methyl ketone at one end and an aldehyde (C=O…MediumSingle correctHas a figure
  2. 12 Apr 2023, Shift 1 · Q77[figure: Me−C(=O)\mathrm{Me-C(=O)}-(zig-zag chain)-C(=O)−CH3\mathrm{C(=O)-CH_3} --OEt−\mathrm{OEt^-}, Δ\Delta--> 'A' major Product] A in the above…MediumSingle correctHas a figure
  3. 26 Feb 2021, Shift 2 · Q44Identify A in the given chemical reaction. [structure drawn: benzene ring with two adjacent CH2CH2CHO\mathrm{CH_2CH_2CHO} substituents]…MediumDiagram basedHas a figure
  4. 9 Jan 2020, Shift 2 · Q44In the following reaction A is : A…MediumSingle correctHas 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.