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Saturday, 31 October

JEE Main 2024 · ChemistryMultiple choiceSingle correctEasyApplication

JEE Main 30 January 2024, Shift 1, Chemistry Q70

Question 70 of 90 in this shift, Chemistry question 10 of 30, Section A.

Structure of 4-Methylpent-2-enal is :

The figure, in words

Options are drawn structural formulas (aldehyde C(=O)-H drawn explicitly); transcribed as condensed formulas.
  1. (1)CH3−CH2−C(CH3)=CH−CHO\mathrm{CH_3-CH_2-C(CH_3)=CH-CHO}
  2. (2)(CH3)2CH−CH=CH−CHO\mathrm{(CH_3)_2CH-CH=CH-CHO}Official answer
  3. (3)CH3−CH2−CH=C(CH3)−CHO\mathrm{CH_3-CH_2-CH=C(CH_3)-CHO}
  4. (4)CH2=CH−CH(CH3)−CH2−CHO\mathrm{CH_2=CH-CH(CH_3)-CH_2-CHO}

Official answer

Option 2

NTA final key.

Chapter
Organic Chemistry: Some Basic Principles and Techniques
Topic
IUPAC Nomenclature
Idea tested
Oxo vs Formyl Prefixes

Same topic in other shifts

All IUPAC Nomenclature questions
  1. 2 Apr 2026, Shift 1 · Q65In IUPAC nomenclature, the correct order of decreasing priority of functional group is :EasySingle correct
  2. 3 Apr 2025, Shift 2 · Q66What is the correct IUPAC name of [structure] ?EasyDiagram basedHas a figure
  3. 4 Apr 2025, Shift 2 · Q64The IUPAC name of the following compound is : HC≡C−CH2−CH(OH)−CH2−CH=CH2\mathrm{HC\equiv C-CH_2-CH(OH)-CH_2-CH=CH_2}MediumSingle correct
  4. 7 Apr 2025, Shift 1 · Q65Which of the following is the correct IUPAC name of given organic compound (X)?EasySingle correctHas a figure
  5. 8 Apr 2025, Shift 2 · Q63What is the correct IUPAC name of [structure: cyclopentene ring with an ethyl group on one ring carbon and an OH group on another] ?MediumSingle correctHas a figure
  6. 5 Apr 2024, Shift 2 · Q73The correct nomenclature for the following compound is :MediumDiagram 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 108 of the 174 JEE Main shifts held from 2017 to 2026.