Chapter 20, Problem 22P

Interpretation Introduction

(a)

Interpretation:

The structure of aD- aldotriose needs to be drawn.

Concept introduction:

Sugar molecules can be named as D or L sugars according to their most oxidized carbon at the top of the Fisher projection. Aldotriose is a three carbon aldehyde sugar.

Interpretation Introduction

(b)

Interpretation:

The structure of a L- ketohexose needs to be drawn.

Concept introduction:

Sugar molecules can be named as D or L sugars according to their most oxidized carbon at the top of the Fisher projection. Ketohexose is a six carbon ketone sugar.

Interpretation Introduction

(c)

Interpretation:

The structure of a four carbon aldonic acid needs to be drawn.

Concept introduction:

When an aldehyde group in an open chain aldose molecule is oxidized into carboxylic acid, it is called as aldonic acid.