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Friday, 9 October

JEE Main 2020 · ChemistryMultiple choiceDiagram basedEasyApplication

JEE Main 2 September 2020, Shift 1, Chemistry Q39

Question 39 of 75 in this shift, Chemistry question 14 of 25.

The IUPAC name for the following compound is :

The figure, in words

Structure: H3C-CH(CHO)-CH=CH-CH(CH3)-COOH (a CHO group on the carbon bearing H3C, a trans C=C, then a carbon bearing CH3 and COOH).
  1. (1)2, 5-dimethyl-6-oxo-hex-3-enoic acidOfficial answer
  2. (2)6-formyl-2-methyl-hex-3-enoic acid
  3. (3)2, 5-dimethyl-5-carboxy-hex-3-enal
  4. (4)2, 5-dimethyl-6-carboxy-hex-3-enal

Official answer

Option 1

NTA final key (Sep 2020).

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. 7 Apr 2025, Shift 1 · Q65Which of the following is the correct IUPAC name of given organic compound (X)?EasySingle correctHas a figure
  3. 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
  4. 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

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.