Question

Identify each of the following as the D or L enantiomer:

a. b.

c. d.

Short answer

a. The threose is D enantiomer.

b. The xylulose is D enantiomer.

c. The mannose is L enantiomer.

d. The allose is D enantiomer.

Step-by-step solution

Part (a) Step 1: Given Information

We need to identify threose is D or L enantiomer.

Part (a) Step 2: Explanation

In a natural molecule, if the -OH bunch is connected to the base chiral focus and it focuses towards the right then the compound is a D-enantiomer.

In the given construction of threose, the - OH bunch is connected to the base chiral focus and it focuses towards the right. Consequently, it's a D-enantiomer.

Part (b) Step 1: Given Information

We need to identify whether xylulose is D or L enantiomer.

Part (b) Step 2: Explanation

In a natural molecule, if the - OH bunch is connected to the base chiral focus and it focuses towards the right then the compound is a D-enantiomer.

In the given design of xylulose, the -OH bunch is appended to the base chiral focus and it focuses towards the right. Hence, it's a D-enantiomer.

Part (c) Step 1: Given Information

We need to identify whether mannose is D or L enantiomer.

Part (c) Step 2: Explanation

In a natural molecule, if - OH bunch is appended to the base chiral focus and it focuses towards the left then the compound is an L-enantiomer.

In the given construction of Mannose, the -OH bunch is connected to the base chiral focus and it focuses towards the left. In this manner, it's an L-enantiomer.

Part (d) Step 1: Given Information

We need to identify allose is D or L enantiomer.

Part (d) Step 2: Explanation

In a natural molecule, if the - OH bunch is joined to the base chiral focus and it focuses towards the right then the compound is a D-enantiomer.

In the given construction of allose, the -OH bunch is joined to the base chiral focus and it focuses towards the right. Thusly, it's a D-enantiomer.