D-Glyceraldehyde and L-Glyceraldehyde are `C-2` epimers as well as enantiomers?

Answer

To determine whether D-Glyceraldehyde and L-Glyceraldehyde are C-2 epimers as well as enantiomers, we can follow these steps:

### Step 1: Understand the Definitions
- **Epimers**: Epimers are sugars that differ in configuration at only one specific carbon atom (stereocenter).
- **Enantiomers**: Enantiomers are a pair of molecules that are non-superimposable mirror images of each other.

### Step 2: Identify the Structure of D-Glyceraldehyde and L-Glyceraldehyde
- D-Glyceraldehyde has the hydroxyl group (OH) on the right side of the second carbon (C-2) when drawn in the Fischer projection.
- L-Glyceraldehyde has the hydroxyl group (OH) on the left side of the second carbon (C-2) when drawn in the Fischer projection.

### Step 3: Analyze the Configuration
- In D-Glyceraldehyde, the configuration at C-2 is R (right).
- In L-Glyceraldehyde, the configuration at C-2 is S (left).
- Since they differ only at C-2, they are classified as epimers.

### Step 4: Check for Enantiomerism
- D-Glyceraldehyde and L-Glyceraldehyde are mirror images of each other.
- Since they cannot be superimposed on one another, they are classified as enantiomers.

### Conclusion
D-Glyceraldehyde and L-Glyceraldehyde are indeed C-2 epimers because they differ at the second carbon, and they are also enantiomers because they are non-superimposable mirror images of each other.

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