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Saturday, 31 October

JEE Main 2021 · ChemistryMultiple choiceDiagram basedMediumRecall

JEE Main 17 March 2021, Shift 1, Chemistry Q50

Question 50 of 90 in this shift, Chemistry question 20 of 30, Section A.

Which of the following is correct structure of tyrosine ?

The figure, in words

All four options are drawn structures (COOH on top, H2N on left, H on right of the central carbon), described in the options.
  1. (1)[figure: H2N-C(COOH)-H centre (Fischer-type cross) with a CH2 attached to a benzene ring bearing OH at the 1,3-position relative to the attachment]
  2. (2)[figure: H2N-C(COOH)-H centre with a two-carbon zigzag chain attached to a benzene ring bearing OH at the 1,3-position relative to the attachment]
  3. (3)[figure: H2N-C(COOH)-H centre with a CH2 attached to a benzene ring bearing OH at the 1,4-position (opposite) relative to the attachment]Official answer
  4. (4)[figure: H2N-C(COOH)-H centre with a two-carbon zigzag chain attached to a benzene ring bearing OH at the 1,4-position (opposite) relative to the attachment]

Official answer

Option 3

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.