Which of the following is different with refered to D, L-Configuration ?

Options

A.
B.
C.
D.

Answer

To determine which of the given molecules is different with respect to D, L-configuration, we need to analyze each molecule based on the following steps:

### Step 1: Understand D, L-Configuration
- D and L configurations are based on the position of the hydroxyl (-OH) group on the last chiral carbon of a sugar molecule.
- If the hydroxyl group is on the right side of the chiral carbon, it is designated as D (Dextrorotatory). If it is on the left side, it is designated as L (Levorotatory).

### Step 2: Identify the Longest Carbon Chain
- For each molecule, we need to identify the longest carbon chain. This chain should be arranged vertically in the structure.

### Step 3: Identify the Most Oxidized Group
- The most oxidized group (usually a carboxylic acid group -COOH) should be placed on the first carbon of the longest chain.

### Step 4: Locate the Last Chiral Carbon
- Identify the last chiral carbon in the molecule. A chiral carbon is one that has four different groups attached to it.

### Step 5: Determine the Position of the Hydroxyl Group
- Check the position of the hydroxyl group (-OH) on the last chiral carbon:
- If it is on the right side, the configuration is D.
- If it is on the left side, the configuration is L.

### Step 6: Compare the Configurations of All Molecules
- After determining the D or L configuration for each molecule, compare them to find which one is different from the others.

### Conclusion
- Based on the analysis, if three molecules have the D configuration and one has the L configuration, the one with the L configuration is the different one.