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Saturday, 31 October

JEE Main 2025 · ChemistryMultiple choiceSingle correctMediumApplication

JEE Main 8 April 2025, Shift 2, Chemistry Q63

Question 63 of 75 in this shift, Chemistry question 13 of 25, Section A.

What is the correct IUPAC name of [structure: cyclopentene ring with an ethyl group on one ring carbon and an OH group on another] ?

The figure, in words

Five-membered ring with one C=C double bond at the bottom of the ring; an ethyl group (CH2CH3) attached to the upper-left ring carbon and an OH group attached to the right-hand ring carbon (the carbon adjacent to the double bond).
  1. (1)1-Ethyl-3-hydroxycyclopent-2-ene
  2. (2)4-Ethyl-1-hydroxycyclopent-2-ene
  3. (3)4-Ethylcyclopent-2-en-1-olOfficial answer
  4. (4)1-Ethylcyclopent-2-en-3-ol

Official answer

Option 3

NTA final key.

Chapter
Organic Chemistry: Some Basic Principles and Techniques
Topic
IUPAC Nomenclature
Idea tested
Cyclic Compound Naming

Same idea in other shifts

Asked 2× in all
  1. 27 Jan 2024, Shift 1 · Q70IUPAC name of following compound (P) is :EasySingle correctHas 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 108 of the 174 JEE Main shifts held from 2017 to 2026.