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Friday, 9 October

JEE Main 2022 · ChemistryNumerical answerNumerical valueHardMulti-step

JEE Main 25 July 2022, Shift 1, Chemistry Q90

Question 90 of 90 in this shift, Chemistry question 30 of 30, Section B.

In the given reaction [cyclopentane ring bearing, on the same carbon, a CH3\mathrm{CH_3} group and a C(=O)OEt\mathrm{C(=O)OEt} group, and on the adjacent ring carbon a CH2−C(=O)−CH3\mathrm{CH_2{-}C(=O){-}CH_3} side chain] → OˉEt \xrightarrow{\ \bar{\mathrm{O}}\mathrm{Et}\ } A (Where Et is −C2H5-\mathrm{C_2H_5}) The number of chiral carbon/s in product A is ______.

The figure, in words

Cyclopentane ring: one ring carbon carries H3C and C(=O)-OEt; the adjacent ring carbon carries a CH2-C(=O)-CH3 side chain. Reagent: ethoxide (EtO-) over the arrow, product A.

Official answer

2

NTA final key (2022 Session 2).

Chapter
Aldehydes, Ketones and Carboxylic Acids
Topic
Carboxylic Acids and Derivatives
Idea tested
Dieckmann Condensation

Same topic in other shifts

All Carboxylic Acids and Derivatives questions
  1. 5 Apr 2026, Shift 2 · Q65Complete the following reaction sequence and give the name of major product 'P'. CH3CH2C≡N\mathrm{CH_3CH_2C{\equiv}N}…MediumSingle correctHas a figure
  2. 8 Apr 2026, Shift 2 · Q67Consider the following reaction. [figure: N-substituted 2-piperidone (six-membered lactam, C=O adjacent to ring N) with N bonded to…HardDiagram basedHas a figure
  3. 2 Apr 2025, Shift 1 · Q67Consider the following molecules : (p) CH3−CH2−C(=O)−Cl\mathrm{CH_3-CH_2-C(=O)-Cl} (q) CH3−CH2−C(=O)−O−C(=O)−CH3\mathrm{CH_3-CH_2-C(=O)-O-C(=O)-CH_3} (r)…EasySingle correctHas a figure
  4. 2 Apr 2025, Shift 2 · Q68Consider the following reactions. From these reactions which reaction will give carboxylic acid as a major product ? (A)…MediumOtherHas a figure
  5. 8 Apr 2025, Shift 2 · Q69A→(ii) H3O+(i) NaOHB→(ii) H2SO4,Δ(i) EtOHCA \xrightarrow[\text{(ii) H}_3\text{O}^+]{\text{(i) NaOH}} B \xrightarrow[\text{(ii) H}_2\text{SO}_4, \Delta]{\text{(i) EtOH}} C 'A'…MediumSingle correctHas a figure
  6. 8 Apr 2024, Shift 1 · Q79Identify the product (P) in the following reaction: [figure: cyclopentanecarboxylic acid]…EasyDiagram 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 42 of the 174 JEE Main shifts held from 2017 to 2026.