Chapter 20.11, Problem 24P

a)

Interpretation Introduction

Interpretation:

The $\text{OH}$ groups present at axial position in $\beta -\text{D}$-idopyranose are to be identified.

Concept Introduction:

Sugar molecule in which hydroxyl groups of first and sixth carbon atom are on the same side is known as $\alpha$ sugar, otherwise, $\beta$ sugar.  Hydroxyl group of $\alpha$-sugar present on right side in Fischer projection is represented down in Haworth projection and at axial position in chair conformation.

b)

Interpretation Introduction

Interpretation:

The $\text{OH}$ groups present at axial position in $\alpha -\text{D}$-allopyranose are to be identified.

Concept Introduction:

Sugar molecule in which hydroxyl groups of first and sixth carbon atom are on the same side is known as $\alpha$ sugar, otherwise, $\beta$ sugar.  Hydroxyl group of $\alpha$-sugar present on right side in Fischer projection is represented down in Haworth projection and at axial position in chair conformation.