Which of the following statement is not true abount glucose?

Options

A. It is an aldohexose
B. It contains five hydroxyl groups
C. It is a reducing sugar
D. It is an aldopentose

Answer

To determine which statement is not true about glucose, we will analyze each option provided in the question.

### Step-by-Step Solution:

1. **Understanding the Structure of Glucose**:
- Glucose has the molecular formula C6H12O6. This indicates that it contains 6 carbon atoms.

2. **Analyzing Option 1: "It is an aldohexose."**
- The term "aldohexose" refers to a sugar that has an aldehyde group and contains six carbon atoms. Since glucose has an aldehyde group (CHO) and six carbons, this statement is **true**.

3. **Analyzing Option 2: "It contains 5 hydroxyl groups."**
- The structure of glucose shows that it has five hydroxyl (–OH) groups. Therefore, this statement is also **true**.

4. **Analyzing Option 3: "It is a reducing sugar."**
- A reducing sugar is one that can donate electrons to another chemical species, typically because it has a free aldehyde or ketone group. Glucose has a free aldehyde group, making it a reducing sugar. Thus, this statement is **true**.

5. **Analyzing Option 4: "It is an aldopentose."**
- The term "aldopentose" refers to a sugar with an aldehyde group and five carbon atoms. Since glucose has six carbon atoms, this statement is **false**.

### Conclusion:
The statement that is not true about glucose is: **"It is an aldopentose."**