Iodoform test is not given by:

Options

A. 2–pentanone
B. 3–pentanone
C. Ethanol
D. None of these

Answer

To determine which compound does not give the Iodoform test, we first need to understand the criteria for a compound to yield a positive result in this test.

### Step-by-Step Solution:

1. **Understanding the Iodoform Test**:
The Iodoform test is used to identify the presence of methyl ketones or secondary alcohols with a methyl group adjacent to the carbonyl group. The general structure for a compound that gives a positive Iodoform test is:
- For ketones: R-CO-CH3 (where R can be any alkyl group)
- For alcohols: R-CHOH-CH3

2. **Identifying the Compounds**:
We need to analyze the given options to see which one does not fit the criteria for the Iodoform test. Let's consider the following examples:
- **2-Pentanone**:
- Structure: CH3-CO-CH2-CH2-CH3
- This is a methyl ketone (since it has the structure R-CO-CH3), so it will give a positive Iodoform test.
- **3-Pentanone**:
- Structure: CH3-CH2-CO-CH2-CH3
- This is not a methyl ketone (it does not have the structure R-CO-CH3), so it will not give a positive Iodoform test.
- **Ethanol**:
- Structure: CH3-CH2-OH
- Ethanol is a primary alcohol, but it can be oxidized to acetaldehyde (which is a methyl aldehyde), thus it can give a positive Iodoform test.

3. **Conclusion**:
Based on the analysis:
- 2-Pentanone gives a positive Iodoform test.
- 3-Pentanone does not give a positive Iodoform test.
- Ethanol can give a positive Iodoform test when oxidized to acetaldehyde.

Thus, the compound that does not give the Iodoform test is **3-Pentanone**.

### Final Answer:
**3-Pentanone does not give the Iodoform test.**