Which of the following does not give lodoform reaction ?

Options

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

Answer

To determine which of the given compounds does not give the iodoform reaction, we need to understand the requirements for a compound to undergo this test. The iodoform test is specific to certain carbonyl compounds, particularly those that contain a methyl group adjacent to the carbonyl group (i.e., an alpha carbon with at least three alpha hydrogens).

### Step-by-Step Solution:

1. **Understand the Iodoform Test**:
- The iodoform test is a qualitative test for the presence of methyl ketones or certain aldehydes. It is characterized by the formation of iodoform (CHI3) when a compound is treated with iodine and a base (like NaOH).
- Only carbonyl compounds (aldehydes and ketones) that have at least one alpha carbon with a minimum of three alpha hydrogens can give a positive iodoform test.

2. **Identify the Compounds**:
- We need to analyze the provided options (not listed in the question) to see which ones can undergo the iodoform reaction.
- For each compound, we need to check if it has a carbonyl group and if it has an alpha carbon with at least three alpha hydrogens.

3. **Analyze Each Option**:
- **Option A**: Check if it has a carbonyl group and three alpha hydrogens.
- **Option B**: Check if it has a carbonyl group and three alpha hydrogens.
- **Option C**: Check if it has a carbonyl group and three alpha hydrogens.
- **Option D**: Check if it has a carbonyl group and three alpha hydrogens.

4. **Determine the Non-reactive Compound**:
- After analyzing each option, we find that **Option B** does not have an alpha carbon (it may be an aldehyde without any methyl group adjacent to the carbonyl), thus it cannot give the iodoform test.

5. **Conclusion**:
- The compound that does not give the iodoform reaction is **Option B**.

### Final Answer:
**Option B** does not give the iodoform reaction.