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Saturday, 31 October

JEE Main 2021 · ChemistryMultiple choiceDiagram basedMediumDiagram reading

JEE Main 27 August 2021, Shift 2, Chemistry Q46

Question 46 of 90 in this shift, Chemistry question 16 of 30, Section A.

The compound/s which will show significant intermolecular H-bonding is/are : [three structures drawn: (a) a benzene ring with NO2\mathrm{NO_2} at the top and OH on the adjacent ring carbon (upper right); (b) a benzene ring with HO at the lower left and, at the upper right, an N-H group (H printed above N) bonded to a carbon bearing =O (below) and CH3\mathrm{CH_3}; (c) a benzene ring with a plain line substituent on the left, a line substituent ending in three short lines (branched, drawn at the top right) and another similar branched line substituent (bottom), and OH on the right]

The figure, in words

Three labelled structures (a), (b), (c) of substituted benzene rings: (a) NO2 and OH on adjacent ring carbons; (b) HO and NH-C(=O)-CH3; (c) a plain line substituent, two branched line substituents (three lines meeting at one point, top and bottom) and OH.
  1. (1)(a), (b) and (c)
  2. (2)(a) and (b) only
  3. (3)(b) onlyOfficial answer
  4. (4)(c) only

Official answer

Option 3

NTA final key.

Chapter
Chemical Bonding and Molecular Structure
Topic
Organic Acidity and Basicity
Idea tested
Intramolecular H-Bonding in Phenols

Same idea in other shifts

Asked 2× in all
  1. 3 Sep 2020, Shift 2 · Q28Consider the following molecules and statements related to them : (A) [figure] (B) [figure] (a) (B) is more likely to be crystalline than…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.