COMEDK202510 May 2025Evening ShiftChemistryBiomoleculesActual
Which one of the following is the correct statement?
Options
- AFructose exists as a five membered ring named furanose.
- BAmylose is a water insoluble branched chain polymer of -D-( - )-glucose.
- CGlucose gives Saccharic acid on reaction with Br ₂ water.
- DCellulose is a branched chain polysaccharide having only -D-glucose units.
Correct answer
A. Fructose exists as a five membered ring named furanose.
Step-by-step solution
Fructose exists in a five-membered ring structure known as a furanose ring, which is formed by the intramolecular reaction between the carbonyl group at C-2 and the hydroxyl group at C-5. This statement is correct. Amylose is a linear, water-soluble polymer of -D-glucose units, not a branched chain polymer. Amylopectin is the branched component of starch. Glucose reacts with Br ₂ water to form gluconic acid, which is a monocarboxylic acid. Saccharic acid (glucaric acid) is formed by the oxidation of glucose with st