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Saturday, 31 October

JEE Main 2021 · ChemistryMultiple choiceDiagram basedMediumDiagram reading

JEE Main 27 August 2021, Shift 1, Chemistry Q49

Question 49 of 90 in this shift, Chemistry question 19 of 30, Section A.

Out of following isomeric forms of uracil, which one is present in RNA ?

The figure, in words

All four options are six-membered ring structures as described in the options.
  1. (1)[figure: six-membered ring; O at top (C=O), HN at upper left, O at lower left (C=O), N with H at lower right, C=C on the right edge]Official answer
  2. (2)[figure: six-membered ring; OH at top, N at upper left (C=N), O at lower left (C=O), N with H at lower right, C=C on the right edge]
  3. (3)[figure: six-membered ring; O at top (C=O), HN at upper left, HO at lower left, N at lower right (C=N), C=C on the right edge]
  4. (4)[figure: six-membered ring; OH at top, N at upper left (C=N), HO at lower left, N at lower right (C=N), C=C on the right edge]

Official answer

Option 1

NTA final key.

Chapter
Biomolecules
Topic
No close match in our taxonomy
Idea tested
No close match in our taxonomy

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.