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Saturday, 31 October

JEE Main 2021 · ChemistryMultiple choiceDiagram basedMediumApplication

JEE Main 27 August 2021, Shift 1, Chemistry Q44

Question 44 of 90 in this shift, Chemistry question 14 of 30, Section A.

The structure of the starting compound P used in the reaction given below is : P →2. H3O+1. NaOCl\xrightarrow[\text{2. }\mathrm{H_3O^+}]{\text{1. NaOCl}} [product drawn]

The figure, in words

Product drawn as a skeletal zigzag chain with one C=C double bond and a terminal group with C=O (O drawn below) and OH printed at the right (a carboxylic acid group as drawn).
  1. (1)[figure: skeletal zigzag chain with one C=C double bond and a C=O drawn below a chain carbon, ending in a terminal methyl line]Official answer
  2. (2)[figure: skeletal zigzag chain with one C=C double bond ending in C(=O)H, O drawn below, H printed at the right]
  3. (3)[figure: six-membered ring containing one O atom and one C=C double bond]
  4. (4)[figure: five-membered ring with a C=O (O drawn above the ring)]

Official answer

Option 1

NTA final key.

Chapter
Aldehydes, Ketones and Carboxylic Acids
Topic
Aldol and Cannizzaro
Idea tested
Haloform Interference with Aldol

Same idea in other shifts

Asked 2× in all
  1. 26 Aug 2021, Shift 1 · Q45The major products formed in the following reaction sequence A and B are : [figure: hexagonal ring joined to a carbonyl carbon (C=O) which…MediumOtherHas 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.