Chapter 23.4, Problem 23.10P

(a)

Interpretation Introduction

To draw: The structure of $\text{D}-\text{arabinofuranose}$.

Interpretation: The figure representing the degradation of $\text{D}-\text{glucose}$ to $\text{D}-\text{arabinofuranose}$ and information regarding arabinose being more stable in furanose form is given. The structure of $\text{D}-\text{arabinofuranose}$ is to be drawn.

Concept introduction: The representation of carbohydrates in the form of a five membered ring having four carbon atoms and one oxygen atom is known as furanose form.

(b)

Interpretation Introduction

To draw: The structure of $\text{D}-\text{ribofuranose}$.

Interpretation: The information regarding ribose being $\text{C}2$ epimer of arabinose and being more stable in furanose form is given. The structure of $\text{D}-\text{ribofuranose}$ is to be drawn.

Concept introduction: The representation of carbohydrates in the form of a five membered ring having four carbon atoms and one oxygen atom is known as furanose form.