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Friday, 9 October

JEE Main 2022 · ChemistryNumerical answerNumerical valueEasyDiagram reading

JEE Main 29 June 2022, Shift 1, Chemistry Q89

Question 89 of 90 in this shift, Chemistry question 29 of 30, Section B.

Observe structures of the following compounds [figure: five structures] The total number of structures/compounds which possess asymmetric carbon atoms is ____________.

The figure, in words

Five skeletal structures: (1) 2-chlorobutane (Cl on the second carbon of a four-carbon chain); (2) glycine, H2N-CH2-COOH; (3) alanine, CH3-CH(NH2)-COOH; (4) styrene (vinylbenzene); (5) menthol (cyclohexane with a methyl, an isopropyl and an OH substituent).

Official answer

3

NTA final key (2022 Session 1).

Chapter
Organic Chemistry: Some Basic Principles and Techniques
Topic
Stereoisomerism
Idea tested
Chiral Centers

Same idea in other shifts

Asked 4× in all
  1. 4 Apr 2026, Shift 2 · Q65The following structures are [figure: stereocentre C with Br (up), CH3 (hashed, left), Me (down), Cl (wedge, right)] and [figure:…EasyDiagram basedHas a figure
  2. 8 Jan 2020, Shift 1 · Q50The number of chiral centres in penicillin is ______.MediumNumerical value
  3. 2 Sep 2020, Shift 1 · Q50The number of chiral carbons present in the molecule given below is ______.MediumNumerical valueHas 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.