Example 1 · difficulty 1/5
Which description correctly classifies fructose?
- A. A ketohexose
- B. An aldohexose
- C. A ketopentose
- D. A disaccharide
2020 source guide · Chemistry
NEET 2020 Chemistry Biomolecules Questions
Connect the official 2020 paper with current Chemistry practice without labelling original previews as PYQs.
150 original questions · explicit provenance labels
ChemistryPlate 91
NeetVellum atlas · fig. chemistry
91
What to master
carbohydrates, proteins, enzymes, vitamins and nucleic acids.
Original practice preview
These are current-syllabus NeetVellum questions, shown separately from historical-paper provenance.
Example 2 · difficulty 2/5
Prolonged heating of glucose with excess hydrogen iodide produces which compound, and what structural inference follows?
- A. 2-Methylpentane, showing a branched six-carbon skeleton
- B. n-Hexane, showing an unbranched chain of six carbon atoms
- C. Hexan-1-ol, showing that one hydroxyl group remains
- D. Cyclohexane, showing that glucose has a carbocyclic skeleton
Example 3 · difficulty 2/5
Glucose reacts with hydroxylamine through the small amount of its open-chain form present in solution. What product is formed, and what does the reaction indicate?
- A. A glycoside, indicating an ether group
- B. A cyanohydrin, indicating a nitrile group
- C. An oxime, indicating a carbonyl group
- D. An ester, indicating a carboxyl group
The evidence-first practice loop
- 1. Verify provenanceOfficial paper and final key before accepting a PYQ label.
- 2. Attempt closed-bookExpose the concept or execution gap before rereading.
- 3. Repair and returnClassify the miss and re-practice after a delay.
Canonical chapter practice
Frequently asked questions
Are these official NEET 2020 Chemistry Biomolecules PYQs?
No. The previews are original NeetVellum practice questions. A historical item receives a PYQ label only after its official paper and authoritative final answer key are attached. Use the official archive for the source paper.
How should I use the NEET 2020 paper?
Solve the official paper under its original timing, verify against the final key, classify every miss, and then use the linked current-syllabus practice bank to repair the exposed concept.