JEE Main 2020 · ChemistryNumerical answerNumerical valueMediumRecall

JEE Main 8 January 2020, Shift 1, Chemistry Q50

Question 50 of 75 in this shift, Chemistry question 25 of 25, Section B.

The number of chiral centres in penicillin is ______.

Official answer

3.00 to 3.00

NTA final key (Jan 2020). Any value in the range scored.

Chapter: Chemistry in Everyday Life
Topic: Stereoisomerism
Idea tested: Chiral Centers

Same idea in other shifts

Asked 12× in all

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
8 Apr 2024, Shift 2 · Q89Total number of optically active compounds from the following is ___________. (1) Fischer projection: $\mathrm{CH_3}$ on top; H-C-OH;…MediumNumerical valueHas a figure
1 Feb 2024, Shift 1 · Q89Number of optical isomers possible for 2-chlorobutane ________.EasyNumerical value
11 Apr 2023, Shift 2 · Q79Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R. Assertion A : A solution of the…MediumAssertion–reason
29 Jul 2022, Shift 2 · Q75Given below are two statements. Statement I: The compound [figure: compound (A), a drawn structure with a stereocentre bearing…MediumTwo statementsHas a figure
29 Jun 2022, Shift 1 · Q89Observe structures of the following compounds [figure: five structures] The total number of structures/compounds which possess asymmetric…EasyNumerical valueHas a figure
29 Jun 2022, Shift 2 · Q88The number of chiral alcohol(s) with molecular formula $\mathrm{C_4H_{10}O}$ is _____.MediumNumerical value
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. Lumi analyses 108 of the 174 JEE Main shifts held from 2017 to 2026.