The letters ‘D’ or ‘L’ before the name of a stereoisomer of a compound indicate the correlation of configuration of that particular stereoisomer. This refers to their relation with one of the isomers of glyceraldehyde. Predict whether the following compound has ‘D’ or ‘L’ configuration.

Under what conditions glucose is converted to gluconic and saccharic acid?

Monosaccharides contain carbonyl group hence are classified, as aldose or ketose. The number of carbon atoms present in the monosaccharide molecule are also considered for classification. In which class of monosaccharide will you place fructose?

Aldopentoses named as ribose and 2-deoxyribose are found in nucleic acids. What is their relative configuration?

Which sugar is called invert sugar? Why is it called so?