All naturally occurring sugars are found to have the D-configuration. How do you assign D or L configuration for a monosaccharide ? Illustrate with a specific example.

All naturally occurring sugars are found to have the D-configuration. How does glucose react with hydroxylamine ? Give equation.

All naturally occurring sugars are found to have the D-configuration. Give a reaction to prove that glucose contain five hydroxyl groups.

The following four compounds A,B,C and D have R or S configurations

Which of the following ions have electronic configuration [Ar]3d^(7)

Consider the following statements concerning proteins I. All natural amino acids which are constituents of proteins, are alpha -amino acids. II. alpha -Amino acids are all optically active and have L-configuration. III. alpha -Amino acids are connected by ester linkages. IV. Favourable conformation for the peptide linkages in protein is the alpha -helix arrangement. Of these statements

Aminoacids, as the name suggests, have both an amino group and a carboxyl group in their structure. In addition, all naturally occurring aminoacids (those which are found in proteins) are called L-aminoacids.From this, can you guess from which compound can the simplest aminoacid be made?

Optical rotations of some compounds along with their structures are given below. Which of them have D configuration?

Monosaccharides containing an aldehyde group are called aldoses while those containing aketo group are called ketoses. The aldehyde group is always present at C_1 while the keto group is usually present at C_2 . All monosaccharides containing five and six carbon atoms have cyclic structures, furnaose (five membered) and pyranose (six membered). During ring formation, C_1 in aldoses and C_2 in ketoses becomes chiral and hence all these monosaccharides exist in two stereoisomeric forms called the alpha -anomer and the beta -anomer while C_1 and C_2 are called glycosidic or anomeric carbon atoms. In contrast, stereoisomers, which differ in configuration at any other chiral carbon other than the glycosidic carbon are called epimers. Two molecules of the same or different monosaccharides combine together through glycosidic linkage to form disaccharides. All monosaccharides (aldoses and ketoses) and most disaccharides reduce Tollens'reagent and Fehling's solution, undergo mutarotation and form osazones. Two forms of D-glucopyranose are called

How do you explain the absence of aldehyde group in the pentaacetate of D-glucose ?