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

Options

A. Three
B. Two
C. One
D. Four

Answer

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

### Step 1: Understand the Structure of Glucose
Glucose has the molecular formula C₆H₁₂O₆. It contains an aldehyde group, which is reactive towards nucleophiles.

**Hint:** Remember that glucose is a hexose sugar with an aldehyde functional group.

### Step 2: Reaction with Phenylhydrazine
Phenylhydrazine (C₆H₅NHNH₂) reacts with the carbonyl group of glucose. In the first step, one molecule of phenylhydrazine will react with the aldehyde group of glucose to form a hydrazone.

**Hint:** Identify the functional groups in glucose that can react with phenylhydrazine.

### Step 3: Formation of Osazone
The formation of osazone involves the reaction of glucose with phenylhydrazine. Each of the three hydroxyl groups (-OH) in glucose can also react with a phenylhydrazine molecule. Therefore, the total number of phenylhydrazine molecules required is three (one for the carbonyl and one for each hydroxyl group).

**Hint:** Consider how many reactive sites are present in the glucose molecule.

### Step 4: Conclusion
Thus, the total number of phenylhydrazine molecules (X) that react with one molecule of glucose to yield osazone is 3.

**Final Answer:** X = 3

### Summary of Steps:
1. Identify the structure of glucose.
2. Recognize the reaction of glucose with phenylhydrazine.
3. Count the total number of reactive sites on glucose.
4. Conclude that 3 molecules of phenylhydrazine are needed.