When D-Glucose reacts with three moles of phenylhydrazine it forms glucosazone. Which of the following carbohydrates will give some osazone as that of D-Glucose?

Options

A.
B.
C.
D.

Answer

To solve the problem, we need to determine which carbohydrates will produce the same osazone as D-Glucose when they react with phenylhydrazine. The key to this question lies in understanding the structure of D-Glucose and how it reacts to form osazones.

### Step-by-Step Solution:

1. **Understanding Osazone Formation**:
- Osazones are formed when reducing sugars react with phenylhydrazine. The reaction involves the carbonyl group (aldehyde or ketone) of the sugar.
- D-Glucose, being an aldose, reacts with phenylhydrazine to form glucosazone.

2. **Structure of D-Glucose**:
- The molecular formula of D-Glucose is C6H12O6.
- Its structure includes an aldehyde group at C1 and hydroxyl groups at C2, C3, C4, and C5.

3. **Identifying the Key Carbons**:
- The osazone formation involves the carbonyl carbon (C1) and the adjacent carbon (C2).
- For a carbohydrate to form the same osazone as D-Glucose, it must have the same structure at these two carbons, while the rest of the structure can vary.

4. **Analyzing the Options**:
- **Option 1**: Fructose (a ketose) has a different carbonyl group but retains the same structure at C2 and other carbons. It can form the same osazone as D-Glucose.
- **Option 2**: Another aldose with the same structure at C1 and C2 as D-Glucose will also form the same osazone.
- **Option 3**: If this carbohydrate has a different structure at either C1 or C2, it will not form the same osazone.
- **Option 4**: Similar reasoning applies; if it differs at C1 or C2, it will not yield the same osazone.

5. **Conclusion**:
- The carbohydrates that will give the same osazone as D-Glucose are those that have the same structure at C1 and C2. Therefore, options that retain these characteristics are correct.

### Final Answer:
- The carbohydrates that will give the same osazone as D-Glucose are **Option 1 and Option 2**.