Which of the following does not give iodoform test

Options

A. `CH_(3)CH_(2)OH`
B. `CH_(3)OH`
C. `CH_(3)CHO`
D. `PhCOCH_(3)`

Explanation

To determine which of the given compounds does not give the iodoform test, we need to analyze each option based on the functional groups present. The iodoform test is positive for compounds that contain a methyl ketone group (R-CO-CH3) or a primary alcohol that can be oxidized to a methyl ketone.

### Step-by-Step Solution:

1. **Identify the Compounds**:
- Option 1: CH3CH2OH (Ethanol)
- Option 2: CH3C(=O)H (Acetaldehyde)
- Option 3: C6H5COCH3 (Acetophenone)
- Option 4: CH3OH (Methanol)

2. **Analyze Each Compound**:
- **Ethanol (CH3CH2OH)**:
- Ethanol is a primary alcohol. When oxidized, it can form acetaldehyde (a methyl ketone), which can give a positive iodoform test.
- **Conclusion**: Ethanol can give the iodoform test.

- **Acetaldehyde (CH3C(=O)H)**:
- Acetaldehyde contains a methyl group adjacent to a carbonyl group (R-CO-CH3), which is characteristic of compounds that give a positive iodoform test.
- **Conclusion**: Acetaldehyde gives the iodoform test.

- **Acetophenone (C6H5COCH3)**:
- Acetophenone also contains a methyl group adjacent to a carbonyl group (R-CO-CH3). Therefore, it will give a positive iodoform test.
- **Conclusion**: Acetophenone gives the iodoform test.

- **Methanol (CH3OH)**:
- Methanol is a simple alcohol and does not have a methyl ketone structure. It cannot be oxidized to form a methyl ketone.
- **Conclusion**: Methanol does not give the iodoform test.

3. **Final Answer**:
- The compound that does not give the iodoform test is **Methanol (CH3OH)**.

### Summary:
The correct answer is **Methanol (CH3OH)**, as it does not contain the necessary structure to provide a positive iodoform test.