Which of the following alchohol gives lodoform test:

Options

A. methanol
B. propan-2-ol
C. pentan-3-ol
D. None of these

Answer

To determine which alcohol gives the Iodoform test, we need to identify the structure of each alcohol and check if they contain the specific group required for the test. The Iodoform test is positive for alcohols that have a methyl group (–CH3) directly attached to the carbon bearing the hydroxyl group (–OH). This is characteristic of secondary alcohols that can be oxidized to form a methyl ketone.

### Step-by-Step Solution:

1. **Identify the Alcohols**: The alcohols given are:
- Methanol (CH3OH)
- Propan-2-ol (CH3CHOHCH3)
- Propan-3-ol (CH3CH2CHOHCH3)
- Pentan-3-ol (CH3CH2CH(OH)CH2CH3)

2. **Check for the Methyl Group**: We need to check if any of these alcohols have the structure CH3CHOH, which indicates the presence of a methyl group adjacent to the hydroxyl group.
- **Methanol**: CH3OH does not have a methyl group adjacent to the hydroxyl group. **No reaction**.
- **Propan-2-ol**: CH3CHOHCH3 has a methyl group adjacent to the hydroxyl group. **Gives positive Iodoform test**.
- **Propan-3-ol**: CH3CH2CHOHCH3 does not have a methyl group adjacent to the hydroxyl group. **No reaction**.
- **Pentan-3-ol**: CH3CH2CH(OH)CH2CH3 does not have a methyl group adjacent to the hydroxyl group. **No reaction**.

3. **Conclusion**: The only alcohol that gives a positive Iodoform test is **Propan-2-ol**.

### Final Answer:
**Propan-2-ol gives the Iodoform test.**

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