Question

Identify each of the following as D or L:

Short answer

(Part a) The structure is $L-$Isomer

(Part b) The structure is $L-$isomeric

(Part c) The structure is $D-$isomeric

Step-by-step solution

Given information (Part a)

The structure is

We have to find the isomer.

Explanation (Part a)

In this problem, we have to identify given structures as D or L.

The difference between $L$and $D$isomers is in the position of the -$OH$group in the penultimate carbon atom. The $OH\hspace{0.17em}$group in the $D$isomer of the penultimate carbon is on the right side, and in $L$isomer is on the left side. In the Figure below, we can see examples of $D$and $L$isomers on glyceraldehyde.

In this example, the penultimate carbon has the hydroxy group on the left side, which means that this structure is the $L$isomer.

Given infomation (b)

The structure is

We have to find the isomer.

Explanation for (b)

In this problem, we have to identify given structures as $D$or $L$.

The difference between $L$and $D$isomers is in the position of the $OH$group in the penultimate carbon atom. The $OH$in the $L$isomer of the penultimate carbon is on the right side, and in $D$isomer is on the left side. In the Figure below, we can see examples of $D$and $L$isomers on glyceraldehyde.

b) In this example, the penultimate carbon has the hydroxy group on the left side, which means that this structure is the $L$isomer.

Given information (c)

The structure is

We have to find the isomer

Explanation for (c)

In this problem, we have to identify given structures as $D$or $L$.

The difference between $L$and $D$isomers is in the position of the $OH$group in the penultimate carbon atom. The $OH$in the $D$isomer of the penultimate carbon is on the right side, and in $L$isomer is on the left side. In the Figure below, we can see examples of $D$and $L$isomers on glyceraldehyde.

In this example, the penultimate carbon has the hydroxy group on the right side, which means that this structure is the D isomer.