The pair of sugars which give the same product with excess phenylhydrazine are:

Options

A. starch and cellulose
B. cellulose and sucrose
C. sucrose and glucose
D. glucose and fructose

Explanation

To solve the question regarding which pair of sugars gives the same product with excess phenylhydrazine, we need to understand the reaction of sugars with phenylhydrazine and the concept of osazone formation.

### Step-by-Step Solution:

1. **Understanding Phenylhydrazine Reaction**:
- Phenylhydrazine reacts with reducing sugars to form osazones. An osazone is a compound formed when a sugar reacts with phenylhydrazine, resulting in a characteristic crystalline product.

2. **Identifying the Sugars**:
- We have four pairs of sugars to consider:
- Option 1: Starch and Cellulose
- Option 2: Cellulose and Sucrose
- Option 3: Sucrose and Glucose
- Option 4: Glucose and Fructose

3. **Analyzing Each Pair**:
- **Starch and Cellulose**: Both are polysaccharides and do not react to form osazones.
- **Cellulose and Sucrose**: Cellulose is a non-reducing sugar, while sucrose is a disaccharide that does not form osazone.
- **Sucrose and Glucose**: Sucrose is a non-reducing sugar, so it will not yield an osazone.
- **Glucose and Fructose**: Both are reducing sugars and can react with phenylhydrazine to form osazones.

4. **Formation of Osazones**:
- When glucose reacts with phenylhydrazine, it forms glucosazone.
- When fructose reacts with phenylhydrazine, it forms fructosazone.
- Despite being different sugars, glucose and fructose differ only in the configuration of their first and second carbon atoms, leading to the formation of the same osazone structure.

5. **Conclusion**:
- The correct answer is **Option 4: Glucose and Fructose**, as they give the same product (osazone) when treated with excess phenylhydrazine.