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Saturday, 31 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 idea in other shifts

Asked 2× in all
  1. 8 Apr 2024, Shift 2 · Q74IUPAC name of following hydrocarbon(X) is : CH3−CH−CH2−CH2−CH−CH−CH2−CH3\mathrm{CH_3-CH-CH_2-CH_2-CH-CH-CH_2-CH_3} (branch CH3\mathrm{CH_3} below the 2nd, 5th and…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.