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Friday, 9 October

JEE Main 2024 · ChemistryMultiple choiceDiagram basedEasyApplication

JEE Main 31 January 2024, Shift 2, Chemistry Q74

Question 74 of 90 in this shift, Chemistry question 14 of 30, Section A.

Identify structure of 2,3-dibromo-1-phenylpentane.

The figure, in words

Each option is a skeletal structure of a phenyl-substituted pentane chain carrying two Br atoms.
  1. (1)[figure: phenyl-CH2-CH2-CH(Br)-CH(Br)-CH3, i.e. 3,4-dibromo-1-phenylpentane skeleton]
  2. (2)[figure: phenyl-CH(Br)-CH(Br)-CH2-CH2-CH3]
  3. (3)[figure: phenyl-CH2-CH(Br)-CH(Br)-CH2-CH3]Official answer
  4. (4)[figure: phenyl-CH(Br)-CH2-CH(Br)-CH2-CH3]

Official answer

Option 3

NTA final key.

Chapter
Haloalkanes and Haloarenes
Topic
IUPAC Nomenclature
Idea tested
Lowest Locant Rule

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. 8 Apr 2024, Shift 1 · Q74Given below are two statements: Statement I: [figure: Compound A, a benzene ring bearing Cl, and two NO2\mathrm{NO_2} groups] IUPAC name of…EasyTwo statementsHas 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.