Select the incorrect statement for glucose.

Options

A. It contains four `gt CHOH` groups
B. It contains one ketone group
C. It contains one `CH_2OH` group
D. It contains one CHO group

Answer

To determine the incorrect statement about glucose, we need to analyze the provided options based on the structure and properties of glucose. Here’s a step-by-step solution:

### Step 1: Understand the Structure of Glucose
Glucose is a monosaccharide, specifically an aldohexose. This means it has six carbon atoms and contains an aldehyde functional group.

### Step 2: Identify the Functional Groups
- **Aldehyde Group**: Glucose contains one aldehyde group at the first carbon atom.
- **Hydroxyl Groups (–OH)**: Glucose has multiple hydroxyl groups attached to its carbon atoms.

### Step 3: Analyze Each Statement
1. **Statement A**: "It contains 4 CHOH groups."
- **Analysis**: Glucose has four hydroxyl (–OH) groups, which can be represented as CHOH. This statement is **correct**.

2. **Statement B**: "It contains 1 ketone group."
- **Analysis**: Glucose does not contain a ketone group; it has an aldehyde group instead. This statement is **incorrect**.

3. **Statement C**: "It contains 1 CHOH group."
- **Analysis**: This statement is misleading as it implies there is only one CHOH group, while there are actually four. However, since it is not explicitly incorrect in the context of glucose having CHOH groups, we consider it **correct** in a general sense.

4. **Statement D**: "It contains 1 CHOH group."
- **Analysis**: Similar to Statement C, this is misleading but not outright incorrect. Glucose has multiple CHOH groups.

### Step 4: Conclusion
The incorrect statement about glucose is **Statement B**: "It contains 1 ketone group."

### Final Answer
**The incorrect statement for glucose is: "It contains 1 ketone group."**

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