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Friday, 9 October

JEE Main 2020 · ChemistryNumerical answerNumerical valueMediumCalculation

JEE Main 2 September 2020, Shift 1, Chemistry Q50

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

The number of chiral carbons present in the molecule given below is ______.

The figure, in words

Large polycyclic molecule: a quinoline ring system bearing a CH(OH)CH3 group (H3C-C(H)(OH)-) on the benzo ring; at position 4 of the quinoline a CH carbon bearing an O-C6H4-CH3 (p-tolyl ether) group and connected to a bicyclic quinuclidine-type amine ring (N-containing bicycle) that carries an ethyl group.

Official answer

5.00

NTA final key (Sep 2020).

Chapter
Haloalkanes and Haloarenes
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. 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
  3. 8 Jan 2020, Shift 1 · Q50The number of chiral centres in penicillin is ______.MediumNumerical value

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.