Which of the following does not give iodoform test?

Options

A. `C_(2)H_(5)OH`
B. `C_(6)H_(5)OH`
C. `(CH_(3))_(2)CHOH`
D. All of these

Explanation

To determine which compound does not give the iodoform test, we need to analyze the given options: ethyl alcohol, phenol, and isopropyl alcohol. The iodoform test is a qualitative test for the presence of methyl ketones or alcohols that can be oxidized to methyl ketones.

### Step-by-Step Solution:

1. **Understanding the Iodoform Test:**
The iodoform test (also known as the haloform test) is positive for compounds that have a methyl group adjacent to a carbonyl group (methyl ketones) or compounds that can be oxidized to such structures. The general structure for these compounds is:
- Methyl ketones: \( RCOCH_3 \)
- Secondary alcohols that can be oxidized to methyl ketones: \( RCHOHCH_3 \)

2. **Analyzing Ethyl Alcohol (C₂H₅OH):**
Ethyl alcohol (or ethanol) can be represented as \( CH_3CH_2OH \).
- It does not have a methyl ketone structure or the ability to be oxidized to one.
- Therefore, ethyl alcohol does **not** give a positive iodoform test.

3. **Analyzing Phenol (C₆H₅OH):**
Phenol has the structure \( C_6H_5OH \).
- It does not contain a methyl group adjacent to a carbonyl or can be oxidized to a methyl ketone.
- Thus, phenol also does **not** give a positive iodoform test.

4. **Analyzing Isopropyl Alcohol (C₃H₇OH):**
Isopropyl alcohol (or 2-propanol) can be represented as \( CH_3CHOHCH_3 \).
- This compound has the structure that allows it to be oxidized to acetone (a methyl ketone), which is \( CH_3COCH_3 \).
- Therefore, isopropyl alcohol does give a positive iodoform test.

5. **Conclusion:**
Among the three compounds:
- Ethyl alcohol does not give the iodoform test.
- Phenol does not give the iodoform test.
- Isopropyl alcohol does give the iodoform test.

The correct answer to the question "Which of the following does not give iodoform test?" is **Phenol (C₆H₅OH)**.

### Final Answer:
**Phenol (C₆H₅OH)** does not give the iodoform test.