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
Use this page to connect the official 2020 paper with current Chemistry practice. NeetVellum does not claim a chapter appeared in that paper until the official question and final key have been mapped.
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.