In addition to an aldehyde group, glucose contains:

Options

A. One secondary and four primary `OH` groups.
B. One primary 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 solve the question "In addition to an aldehyde group, glucose contains:", we will analyze the structure of glucose step by step.

### Step 1: Identify the Structure of Glucose
Glucose is a simple sugar (monosaccharide) with the molecular formula C6H12O6. It has a specific structure that includes an aldehyde group.

### Step 2: Recognize the Aldehyde Group
In the structure of glucose, the aldehyde group (-CHO) is located at one end of the molecule. This is characteristic of aldoses, which are sugars that contain an aldehyde group.

### Step 3: Identify the Hydroxyl Groups
In addition to the aldehyde group, glucose contains multiple hydroxyl groups (-OH).

- **Primary Hydroxyl Group**: There is one primary hydroxyl group attached to the first carbon atom.
- **Secondary Hydroxyl Groups**: There are four secondary hydroxyl groups attached to the second, third, fourth, and fifth carbon atoms.

### Step 4: Count the Hydroxyl Groups
- Total Hydroxyl Groups = 1 (primary) + 4 (secondary) = 5 hydroxyl groups in total.

### Conclusion
In addition to an aldehyde group, glucose contains one primary hydroxyl group and four secondary hydroxyl groups.

### Final Answer
Glucose contains one primary hydroxyl group and four secondary hydroxyl groups in addition to the aldehyde group.

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