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Friday, 9 October

JEE Main 2024 · ChemistryNumerical answerNumerical valueHardMulti-step

JEE Main 8 April 2024, Shift 1, Chemistry Q88

Question 88 of 90 in this shift, Chemistry question 28 of 30, Section B.

The number of optical isomers in following compound is:__________ [figure: three fused cyclohexane rings in a linear (anthracene-type) perhydro skeleton; Br on the ring-fusion carbon between the left and middle rings, CH3\mathrm{CH_3} on the right ring carbon]

The figure, in words

Linear tricyclic fully saturated (perhydroanthracene) skeleton; Br at the top ring-fusion carbon between the left and middle rings; CH3 on the top carbon of the right ring adjacent to the fusion.

Official answer

32

NTA final key.

Chapter
Haloalkanes and Haloarenes
Topic
Stereoisomerism
Idea tested
Counting Optical Isomers

Same idea in other shifts

Asked 2× in all
  1. 30 Jan 2024, Shift 2 · Q882-chlorobutane + Cl2→C4H8Cl2\mathrm{Cl_2} \to \mathrm{C_4H_8Cl_2} (isomers) Total number of optically active isomers shown by…HardNumerical 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.