JEE Main · Chemistry · Biomolecules
D and L Configuration of Sugars
JEE Main asked D and L Configuration of Sugars 3 times in 3 of the 108 shifts Lumi analysed, in 2023, 2024 and 2025. It belongs to Carbohydrates, in Biomolecules (Chemistry). The longest wait between two years asking it was 1 year.
Updated 2026-10-24
- Times asked
- 3
- in 3 shifts
- Years
- 3 of 8
- First asked
- 2023
- last in 2025
- Pattern
- Comes in cycles
- across the analysed shifts
Questions on this idea a shift, by year
2017–2026. Asked in 2023, 2024 and 2025. Years differ in how many shifts Lumi analysed, so each year is scaled to one shift of 25 Chemistry questions.
Raw count: 2017: 0 in 1 shift · 2020: 0 in 12 shifts · 2021: 0 in 24 shifts · 2022: 0 in 24 shifts · 2023: 1 in 12 shifts · 2024: 1 in 18 shifts · 2025: 1 in 8 shifts · 2026: 0 in 9 shifts.
Shift by shift
Each square is one analysed shift, in date order. Open a filled one for that paper.
How JEE Main framed it
Diagram based is the usual form. Skill tested: diagram reading.
- Identify correct fischer projection of sugar
- Identify structure from chemical clues
Difficulty
Every question was multiple choice.
Every question
All 3 questions
From the official JEE Main shift papers, newest first. Open one for the full question, the options and the official answer.
- 3 Apr 2025, Shift 1 · Q70Which of the following is the correct structure of LFructose?MediumDiagram basedHas a figure
- 4 Apr 2024, Shift 1 · Q80Which of the following is the correct structure of L-Glucose ?MediumDiagram basedHas a figure
- 11 Apr 2023, Shift 1 · Q79L-isomer of tetrose X () gives positive Schiff's test and has two chiral carbons. On acetylation, 'X' yields…HardDiagram basedHas a figure
Shifts: 11 Apr 2023, Shift 1, 4 Apr 2024, Shift 1, 3 Apr 2025, Shift 1.
Same topic
Other ideas in Carbohydrates
Carbohydrates has 25 ideas JEE Main has asked; 13 of them came up in more than one question. The 12 most asked are below.
- Reducing vs Non-reducing Sugars4× · 2026
- Selective Oxidation of Monosaccharides4× · 2026
- Maltose Structure and Linkage4× · 2022
- Sucrose Structure and Linkage4× · 2022
- Anomers and Epimers3× · 2026
- Inversion of Cane Sugar3× · 2025
- Seliwanoff's Test3× · 2021
- Hydrolysis-Based Classification of Carbohydrates2× · 2026
- Reduction with HI and Red Phosphorus2× · 2026
- Non-Reducing Nature of Sucrose2× · 2024
- Structure of Glycogen2× · 2022
- Lactose Structure and Linkage2× · 2021