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Saturday, 31 October

JEE Main 2021 · ChemistryMultiple choiceDiagram basedMediumApplication

JEE Main 25 February 2021, Shift 1, Chemistry Q43

Question 43 of 90 in this shift, Chemistry question 13 of 30, Section A.

Identify A in the given chemical reaction.

The figure, in words

Reactant drawn as a zigzag chain with printed labels: CH3 at the top, then CH2, CH2, CH2, then CH carrying two CH3 groups (upper right CH3 and lower right CH3). Arrow labelled Mo2O3, 773 K, 10-20 atm, giving 'A' major product.
  1. (1)[structure: a six-membered ring drawn with alternating double bonds, no substituents]
  2. (2)[structure: a six-membered ring drawn with alternating double bonds, with one CH3_3 substituent]Official answer
  3. (3)[structure: a six-membered ring with only single bonds, no substituents]
  4. (4)[structure: a six-membered ring with only single bonds, with one CH3_3 substituent]

Official answer

Option 2

NTA final key.

Chapter
Hydrocarbons
Topic
Alkanes and Free Radicals
Idea tested
Aromatization (Reforming) of Alkanes

Same idea in other shifts

Asked 2× in all
  1. 26 Feb 2021, Shift 2 · Q42[reaction scheme: structure drawn in line-bond form]…MediumOtherHas 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.