Learn

Friday, 9 October

JEE Main 2025 · ChemistryMultiple choiceDiagram basedMediumDiagram reading

JEE Main 3 April 2025, Shift 1, Chemistry Q70

Question 70 of 75 in this shift, Chemistry question 20 of 25, Section A.

Which of the following is the correct structure of L−-Fructose?

The figure, in words

Four Fischer projections of a ketohexose (CH2OH at both ends, C=O at C2); options differ in the left/right placement of OH on C3, C4 and C5.
  1. (1)[figure: Fischer projection, top to bottom: CH2OH (OH at top), C=O, HO on left, OH on right, HO on left, CH2OH (OH at bottom)]
  2. (2)[figure: Fischer projection, top to bottom: CH2OH, C=O, OH on right, HO on left, HO on left, CH2OH]Official answer
  3. (3)[figure: Fischer projection, top to bottom: CH2OH, C=O, OH on right, OH on right, HO on left, CH2OH]
  4. (4)[figure: Fischer projection, top to bottom: CH2OH, C=O, HO on left, HO on left, HO on left, CH2OH]

Official answer

Option 2

NTA final key.

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

Same idea in other shifts

Asked 2× in all
  1. 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 42 of the 174 JEE Main shifts held from 2017 to 2026.