Chapter 28, Problem 28.1P

Interpretation Introduction

(a)

Interpretation: The structure of ketotetrose is to be drawn.

Concept introduction: A monosaccharide in which aldehyde carbonyl group is present at $\text{C1}$ is called aldose whereas a monosaccharide in which ketone carbonyl group is present at $\text{C2}$ is called ketose.

Answer to Problem 28.1P

The structure of ketotetrose is,

Figure 1

Explanation of Solution

The name ketotetrose suggests that it is a monosaccharide that contains four carbon atoms and a ketone group. The ketone carbonyl group is present on second carbon atom in ketoses. The structure of ketotetrose is shown in Figure 1.

Figure 1

Conclusion

The structure of ketotetrose is shown in Figure 1.

Interpretation Introduction

(b)

Interpretation: The structure of aldopentose is to be drawn.

Concept introduction: A monosaccharide in which aldehyde carbonyl group is present at $\text{C1}$ is called aldose whereas a monosaccharide in which ketone carbonyl group is present at $\text{C2}$ is called ketose.

Answer to Problem 28.1P

The structure of aldopentose is,

Figure 2

Explanation of Solution

The name aldopentose suggests that it is a monosaccharide that contains five carbon atoms and an aldehyde group. The aldehyde carbonyl group is present on first carbon atom in aldoses. The structure of aldopentose is shown in Figure 2.

Figure 2

Conclusion

The structure of aldopentose is shown in Figure 2.

Interpretation Introduction

(c)

Interpretation: The structure of aldotetrose is to be drawn.

Concept introduction: A monosaccharide in which aldehyde carbonyl group is present at $\text{C1}$ is called aldose whereas a monosaccharide in which ketone carbonyl group is present at $\text{C2}$ is called ketose.

Answer to Problem 28.1P

The structure of aldotetrose is,

Figure 3

Explanation of Solution

The name aldotetrose suggests that it is a monosaccharide that contains four carbon atoms and an aldehyde group. The aldehyde carbonyl group is present on first carbon atom in aldoses. The structure of aldotetrose is shown in Figure 3.

Figure 3

Conclusion

The structure of aldotetrose is shown in Figure 3.