CBSE 2026 · Region 3 · Set 1 · Q21 · 2 marks
How do you explain the following?(a)Presence of a straight chain in glucose(b)Presence of five - OH groups in glucose which are attached to different carbon atoms
How do you explain the following?
(a)
Presence of a straight chain in glucose
(b)
Presence of five - OH groups in glucose which are attached to different carbon atoms
Marking-scheme solution
(a)
Glucose on reaction with HI forms n-hexane which confirms the presence
of a straight chain (or chemical equation).
(b)
Glucose on reaction with acetic anhydride gives stable glucose
pentaacetate which confirms the presence of five -OH groups (or chemical
equation).
BiomoleculesCarbohydratesUnderstandvery_short_answermedium
More from Biomolecules
- The specific sequence in which amino acids are arranged in a protein is called its2024 · asked 4×
- Assertion: Glucose gets oxidized to six carbon gluconic acid on reaction with bromine water. Reason (R): The…2026 · asked 3×
- Living systems are made up of various complex biomolecules like carbohydrates, proteins, nucleic acids,…2023 · asked 3×
- Carbohydrates are optically active polyhydroxy aldehydes and ketones. They are also called saccharides. All…2023 · asked 3×
- Identify the polysaccharide among the following:2026 · asked 3×
- Which of the following structures represents α -D-glucose?2023 · asked 3×
- Certain organic compounds are required in small amounts in our diet but their deficiency causes specific…2024 · asked 3×
- Give reasons for any 3 of the following observations: Penta-acetate of glucose does not react with…2023 · asked 3×
CBSE Class 12 Chemistry past-paper question from the 2026board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.