The given structures (I) and (II) represent configuration of the simplest sugar glyceraldehyde . Which of the following statements is not correct for the structures ?
`underset((I))(H-underset(CH_(2)OH)underset(|)overset(CHO)overset(|)C-OH) " " underset((II)) (HO-underset(CH_(2)OH)underset(|)overset(CHO)overset(|)C-H)`

Options

A. (I) represents D-form while (II) represents L-form of glyceraldehyde .
B. The sugars having same configuration as D-glyceraldehyde are designated as D-sugars.
C. Natural glucose and fructose are D-Sugars.
D. D is dextrorotatory while L is laevorotatory enantiomer.

Explanation

To solve the question regarding the configurations of glyceraldehyde, we will analyze the structures provided and evaluate the statements related to them.

### Step-by-Step Solution:

1. **Identify the Structures**:
- Structure (I) represents D-glyceraldehyde.
- Structure (II) represents L-glyceraldehyde.

2. **Understand the Configuration**:
- In D-glyceraldehyde, the hydroxyl (OH) group on the penultimate carbon (the second last carbon) is on the right side.
- In L-glyceraldehyde, the hydroxyl (OH) group on the penultimate carbon is on the left side.

3. **Analyze the Statements**:
- The question asks which statement is NOT correct regarding these structures.
- Statements typically include:
- D-glyceraldehyde has the OH group on the right.
- L-glyceraldehyde has the OH group on the left.
- D and L configurations are related to the optical activity (dextrorotatory and levorotatory).
- The D and L designations are based on the configuration of the penultimate carbon.

4. **Evaluate Optical Activity**:
- D-glyceraldehyde is dextrorotatory (rotates plane-polarized light to the right).
- L-glyceraldehyde is levorotatory (rotates plane-polarized light to the left).
- However, the terms "D" and "L" refer to the configuration, not the optical activity directly.

5. **Identify the Incorrect Statement**:
- The statement that may be incorrect is one that confuses the D and L configuration with their optical activity.
- For example, stating that D refers to dextrorotatory and L refers to levorotatory is misleading because D and L are based on the configuration of the molecule rather than its optical activity.

### Conclusion:
The statement that is NOT correct regarding the structures of glyceraldehyde is likely the one that confuses the D and L nomenclature with their optical activity.