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Saturday, 31 October

JEE Main 2024 · ChemistryMultiple choiceDiagram basedMediumDiagram reading

JEE Main 4 April 2024, Shift 1, Chemistry Q80

Question 80 of 90 in this shift, Chemistry question 20 of 30, Section A.

Which of the following is the correct structure of L-Glucose ?

The figure, in words

Four Fischer projections of a hexose (CHO at top, CH2OH at bottom, four stereocentres); each option differs in the left/right placement of OH on C2-C5, as described in the option text.
  1. (1)[Fischer projection: CHO at top; C2 OH right, C3 HO left, C4 OH right, C5 HO left; CH2OH at bottom]
  2. (2)[Fischer projection: CHO at top; C2 HO left, C3 HO left, C4 OH right, C5 OH right; CH2OH at bottom]
  3. (3)[Fischer projection: CHO at top; C2 HO left, C3 OH right, C4 HO left, C5 HO left; CH2OH at bottom]Official answer
  4. (4)[Fischer projection: CHO at top; C2, C3, C4, C5 all HO on left; CH2OH at bottom]

Official answer

Option 3

NTA final key.

Chapter
Biomolecules
Topic
Carbohydrates
Idea tested
D and L Configuration of Sugars

Same idea in other shifts

Asked 3× in all
  1. 3 Apr 2025, Shift 1 · Q70Which of the following is the correct structure of L−-Fructose?MediumDiagram basedHas a figure
  2. 11 Apr 2023, Shift 1 · Q79L-isomer of tetrose X (C4H8O4\mathrm{C_4H_8O_4}) gives positive Schiff's test and has two chiral carbons. On acetylation, 'X' yields…HardDiagram basedHas 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.