Chapter 21, Problem 96E

(a)

Interpretation Introduction

Interpretation: The chiral carbon atoms found in the monosaccharide’s D-ribose and D-mannose are to be determined.

Concept introduction: Carbohydrates are naturally occurring organic compounds. As the name implies carbohydrates are hydrates of carbon and have general formula of ${\text{C}}_{\text{X}}{\left({\text{H}}_{\text{2}}\text{O}\right)}_{\text{Y}}$. Basically, carbohydrates are $\text{polyhydroxy}$ aldehyde and ketones, for examples, glucose and fructose. Glucose is a six carbon atoms aldehyde sugar whereas fructose is a six carbon atoms ketone sugar. D-ribose and D-mannose are aldehyde sugar belongs to the pentose class. The chiral carbon atom is defined as the carbon atom which has four different group of atoms attached to it.

To determine: The number of chiral carbon atoms in D-ribose.

(b)

Interpretation Introduction

Interpretation: The chiral carbon atoms found in the monosaccharide’s D-ribose and D-mannose are to be determined.

Concept introduction: Carbohydrates are naturally occurring organic compounds. As the name implies carbohydrates are hydrates of carbon and have general formula of ${\text{C}}_{\text{X}}{\left({\text{H}}_{\text{2}}\text{O}\right)}_{\text{Y}}$. Basically, carbohydrates are $\text{polyhydroxy}$ aldehyde and ketones, for examples, glucose and fructose. Glucose is a six carbon atoms aldehyde sugar whereas fructose is a six carbon atoms ketone sugar. D-ribose and D-mannose are aldehyde sugar belongs to the pentose class. The chiral carbon atom is defined as the carbon atom which has four different group of atoms attached to it.

To determine: The number of chiral carbon atoms in D-mannose.