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Saturday, 31 October

JEE Main 2020 · ChemistryMultiple choiceDiagram basedMediumConceptual

JEE Main 9 January 2020, Shift 1, Chemistry Q39

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

Which of these will produce the highest yield in Friedel Crafts reaction ?

The figure, in words

All four options are drawn structures: a six-membered ring with inner double-bond lines carrying one substituent each: option 1 NH2, option 2 OH, option 3 CONH2, option 4 Cl.
  1. (1)[figure: six-membered ring drawn with inner double-bond lines; NH2\mathrm{NH_2} attached to the top vertex]
  2. (2)[figure: six-membered ring drawn with inner double-bond lines; OH attached to the upper-right vertex]
  3. (3)[figure: six-membered ring drawn with inner double-bond lines; CONH2\mathrm{CONH_2} attached to the top vertex]
  4. (4)[figure: six-membered ring drawn with inner double-bond lines; Cl attached to the top vertex]Official answer

Official answer

Option 4

NTA final key (Jan 2020).

Chapter
Hydrocarbons
Topic
Aromatic Hydrocarbons
Idea tested
Friedel-Crafts Failure on Deactivated Rings

Same idea in other shifts

Asked 2× in all
  1. 9 Apr 2024, Shift 2 · Q90Number of compounds from the following which cannot\textbf{cannot} undergo Friedel-Crafts reactions is:________ toluene, nitrobenzene, xylene,…MediumNumerical value

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.