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Karnataka Board PUCPUC Science 2nd PUC Class 12

Biomolecules in the Cell > Carbohydrates - Preparation of Glucose

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Estimated time: 5 minutes
Maharashtra State Board: Class 12

Glucose (Reactions and References)

Product Inference
n-Hexane (hot HI) 6 C in a straight chain
Glucoxime (NH₂OH) / Cyanohydrin (HCN) Carbonyl group present
Gluconic acid (Br₂ water) —CHO group present
Glucose pentaacetate (acetic anhydride) Five —OH groups present
Saccharic acid (dil. HNO₃) One primary —OH group present
Maharashtra State Board: Class 12

Key Points: Preparation of Glucose

  • Glucose is a monosaccharide, an aldohexose, and a reducing sugar, commonly found in fruits and also known as dextrose.
  • It can be prepared by hydrolysis of sucrose (using dilute acid) or hydrolysis of starch under heat and pressure.
  • Glucose confirms a straight-chain structure of six carbon atoms when reduced to n-hexane.
  • Presence of functional groups is shown by reactions: –CHO (aldehyde), five –OH groups, and formation of derivatives like oxime and cyanohydrin.
  • Oxidation reactions indicate the formation of gluconic acid (mild oxidation) and saccharic acid (strong oxidation), confirming functional groups in glucose.

Shaalaa.com | Biomolecules part 5 (Glucose preparation and property)

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