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Friday, 9 October

JEE Main 2025 · ChemistryMultiple choiceSingle correctEasyApplication

JEE Main 7 April 2025, Shift 1, Chemistry Q65

Question 65 of 75 in this shift, Chemistry question 15 of 25, Section A.

Which of the following is the correct IUPAC name of given organic compound (X)?

The figure, in words

Structure (X): CH3CH=C(CH3)CH2Br\mathrm{CH_3CH{=}C(CH_3)CH_2Br} drawn skeletally: H3C on the left alkene carbon (with H), CH3 and CH2Br (H, H, Br) on the right alkene carbon.
  1. (1)4-Bromo-3-methylbut-2-ene
  2. (2)1-Bromo-2-methylbut-2-eneOfficial answer
  3. (3)2-Bromo-2-methylbut-2-ene
  4. (4)3-Bromo-3-methylprop-2-ene

Official answer

Option 2

NTA final key.

Chapter
Organic Chemistry: Some Basic Principles and Techniques
Topic
IUPAC Nomenclature
Idea tested
Functional Group Priority

Same idea in other shifts

Asked 5× in all
  1. 2 Apr 2026, Shift 1 · Q65In IUPAC nomenclature, the correct order of decreasing priority of functional group is :EasySingle correct
  2. 31 Jan 2024, Shift 1 · Q75Given below are two statements: Statement I: IUPAC name of HO−CH2−(CH2)3−CH2−COCH3\mathrm{HO-CH_2-(CH_2)_3-CH_2-COCH_3} is 7-hydroxyheptan-2-one. Statement II:…EasyTwo statements
  3. 8 Apr 2023, Shift 2 · Q72The correct IUPAC nomenclature for the following compound is: [structure: CH3−CO−CH2−CH2−CH(COOH)−CH3\mathrm{CH_3{-}CO{-}CH_2{-}CH_2{-}CH(COOH){-}CH_3}]EasySingle correctHas a figure
  4. 2 Sep 2020, Shift 1 · Q39The IUPAC name for the following compound is :EasyDiagram basedHas 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.