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Saturday, 31 October

JEE Main 2024 · ChemistryMultiple choiceSingle correctEasyApplication

JEE Main 8 April 2024, Shift 2, Chemistry Q74

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

IUPAC 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 6th carbons; labelled (X))

The figure, in words

Condensed structural formula (X): CH3-CH(CH3)-CH2-CH2-CH(CH3)-CH(CH3)-CH2-CH3, with CH3 branches drawn below the 2nd, 5th and 6th carbons
  1. (1)3,4,7-Trimethyloctane
  2. (2)2-Ethyl-3,6-dimethylheptane
  3. (3)2,5,6-TrimethyloctaneOfficial answer
  4. (4)2-Ethyl-2,6-diethylheptane

Official answer

Option 3

NTA final key.

Chapter
Hydrocarbons
Topic
IUPAC Nomenclature
Idea tested
Lowest Locant Rule

Same idea in other shifts

Asked 2× in all
  1. 31 Jan 2024, Shift 2 · Q74Identify structure of 2,3-dibromo-1-phenylpentane.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 108 of the 174 JEE Main shifts held from 2017 to 2026.