Glucose contains in addition to aldehyde groups :

Options

A. one secondary -OH-and four primary -OH groups
B. one primary -OH-and four secondary -OH groups
C. two primary -OH-and three secondary -OH groups
D. three primary -OH and two secondary -OH groups

Answer

To determine the groups present in glucose in addition to the aldehyde group, we will analyze the structure of glucose and identify the types of hydroxyl groups present.

### Step-by-Step Solution:

1. **Identify the Aldehyde Group**:
- Glucose is an aldohexose, meaning it contains an aldehyde group. The aldehyde group is located at the first carbon atom (C1) of the glucose molecule.

2. **Draw the Structure of Glucose**:
- The structure of glucose can be represented as follows:
```
CHO - C - C - C - C - C - CH2OH
| | | | |
OH OH OH OH
```
- In this structure, the aldehyde group (CHO) is at the first carbon.

3. **Identify Hydroxyl Groups**:
- Hydroxyl groups (-OH) are present on the other carbon atoms. We need to classify these hydroxyl groups as either primary or secondary.

4. **Classify Hydroxyl Groups**:
- **Primary Hydroxyl Group**: A hydroxyl group is classified as primary if it is attached to a carbon that is connected to only one other carbon atom.
- **Secondary Hydroxyl Group**: A hydroxyl group is classified as secondary if it is attached to a carbon that is connected to two other carbon atoms.

5. **Count the Hydroxyl Groups**:
- **C1**: Aldehyde group (not counted as hydroxyl)
- **C2**: Hydroxyl group (attached to C2, which is connected to C1 and C3) - **Secondary**
- **C3**: Hydroxyl group (attached to C3, which is connected to C2 and C4) - **Secondary**
- **C4**: Hydroxyl group (attached to C4, which is connected to C3 and C5) - **Secondary**
- **C5**: Hydroxyl group (attached to C5, which is connected to C4 and C6) - **Secondary**
- **C6**: Hydroxyl group (attached to C6, which is connected to C5 and has two hydrogens) - **Primary**

6. **Summary of Hydroxyl Groups**:
- Total Hydroxyl Groups: 5
- Primary Hydroxyl Groups: 1 (C6)
- Secondary Hydroxyl Groups: 4 (C2, C3, C4, C5)

7. **Conclusion**:
- Therefore, glucose contains 1 primary hydroxyl group and 4 secondary hydroxyl groups in addition to the aldehyde group.

### Final Answer:
Glucose contains 1 primary hydroxyl group and 4 secondary hydroxyl groups in addition to the aldehyde group.