Glucose molecule reacts with `X` number of molecules of phenylhydrazine to yield osazone. The value of `X` is.

Options

A. four
B. one
C. two
D. three

Explanation

To determine the number of molecules of phenylhydrazine that react with one molecule of glucose to yield osazone, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Structure of Glucose**:
- Glucose is an aldohexose, meaning it has an aldehyde group and six carbon atoms. The structure consists of an aldehyde group (–CHO) at one end and a chain of five carbon atoms, with hydroxyl (–OH) groups attached.

2. **Identify the Reaction with Phenylhydrazine**:
- Phenylhydrazine (C6H5NHNH2) reacts with the carbonyl group (aldehyde) of glucose. In the case of glucose, the aldehyde group will react with one molecule of phenylhydrazine.

3. **Formation of Osazone**:
- The reaction of glucose with phenylhydrazine leads to the formation of a hydrazone. However, in the case of osazone formation, the reaction involves further interaction with the hydroxyl groups on the glucose molecule.
- Specifically, two molecules of phenylhydrazine will react with the glucose molecule: one with the aldehyde group and one with a hydroxyl group.

4. **Total Molecules of Phenylhydrazine**:
- Therefore, a total of **three molecules of phenylhydrazine** react with one molecule of glucose to yield osazone: two for the modification of the carbon atoms and one for the formation of the hydrazone.

5. **Conclusion**:
- The value of `X`, which represents the number of molecules of phenylhydrazine that react with one molecule of glucose, is **3**.

### Final Answer:
The value of `X` is **3**.

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