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Saturday, 31 October

JEE Main 2022 · ChemistryMultiple choiceDiagram basedMediumApplication

JEE Main 25 July 2022, Shift 2, Chemistry Q74

Question 74 of 90 in this shift, Chemistry question 14 of 30, Section A.

What is the major product of the following reaction ? [figure: skeletal drawing of a carbon chain with a branch point (two bond stubs on a central carbon) joined to a carbonyl carbon (C=O, O drawn below) with an H drawn at the right of that carbon] --(-OH, H2O)-->

The figure, in words

Reactant is a skeletal drawing with a branched alkyl group on a carbonyl carbon (O below) and H at right; reagent over arrow is -OH (hydroxide, printed with a bar before OH) / H2O. Options are skeletal structures each beginning with H-C(=O).
  1. (1)[figure: H-C(=O) joined to a carbon with two short bond stubs, which is joined to a C=C double bond whose far carbon carries two bond stubs]
  2. (2)[figure: H-C(=O) joined to a carbon with two short bond stubs, which is joined to a carbon bearing OH, which is joined to a carbon with two bond stubs]Official answer
  3. (3)[figure: H-C(=O) joined to a carbon with two short bond stubs, which is joined to a second C=O carbon (O drawn above), which is joined to a carbon with two bond stubs]
  4. (4)[figure: H-C(=O) joined to a carbon with a bond stub downward, which is joined by a C=C double bond to a carbon with two bond stubs]

Official answer

Option 2

NTA final key.

Chapter
Aldehydes, Ketones and Carboxylic Acids
Topic
Aldol and Cannizzaro
Idea tested
Self-Aldol Condensation

Same idea in other shifts

Asked 4× in all
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  2. 29 Jun 2022, Shift 2 · Q90In the given reaction, [figure: six-membered ring with a carbonyl oxygen (O double bonded to a ring carbon); reagents over the arrow: (i)…MediumNumerical valueHas a figure
  3. 18 Mar 2021, Shift 2 · Q46[figure: reaction scheme] Consider the above reaction, the product ‘X’ and ‘Y’ respectively are :MediumDiagram 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.