Chemistry - Biomolecules Question with Solution | TestHub
Carbohydrates are polyhydroxy aldehydes or ketones, or substances that yield such compounds upon hydrolysis. In their cyclic forms, they exist as hemiacetals or hemiketals. The structural elucidation of these molecules involves understanding their stereochemistry, ring size, and the nature of their functional groups. A critical aspect of carbohydrate chemistry is the anomeric effect and mutarotation, where the alpha and beta anomers interconvert in solution through an open-chain intermediate. Furthermore, chemical transformations like Kiliani-Fischer synthesis (chain lengthening) and Ruff degradation (chain shortening) are essential tools for determining the configuration of sugars. The "reducing" ability of a sugar depends on the availability of a free hemiacetal group that can open into an aldehyde. If the anomeric carbon is involved in a glycosidic linkage (as in sucrose), the sugar becomes non-reducing.
In the Lobry de Bruyn-van Ekenstein transformation, D-Glucose is placed in a dilute aqueous solution of NaOH . Which of the following species is NOT found in the equilibrium mixture?
Options:
Answer:
Solution:
D-Galactose: This transformation involves epimerization at or keto-enol tautomerism at . Galactose is a C-4 epimer.
