which of the compound give iodoform when react with `IO^(-)` (hypoiodite)

Explanation

To determine which compounds give a positive iodoform test when reacted with hypoiodite (IO⁻), we need to identify the structural features that allow for this reaction. The iodoform test is a qualitative test for the presence of a methyl ketone (R-CO-CH₃) or a secondary alcohol that can be oxidized to a methyl ketone.

### Step-by-Step Solution:

1. **Identify the Functional Groups**:
- The iodoform test is positive for compounds that have a methyl group adjacent to a carbonyl group (C=O) or a secondary alcohol that can be converted to a methyl ketone.
- The specific structure we are looking for is CH₃CO- (a methyl ketone) or R-CHOH-CH₃ (a secondary alcohol).

2. **List Possible Compounds**:
- Consider the compounds that might be tested. Common examples include:
- Ethanol (CH₃CH₂OH)
- Acetone (CH₃COCH₃)
- Butan-2-ol (CH₃CHOHCH₂CH₃)
- Propan-2-ol (CH₃CHOHCH₃)
- Ethyl methyl ketone (CH₃C(O)CH₂CH₃)

3. **Analyze Each Compound**:
- **Ethanol (CH₃CH₂OH)**: Does not have a methyl ketone structure, so it will not give a positive test.
- **Acetone (CH₃COCH₃)**: Has a methyl ketone structure, so it will give a positive iodoform test.
- **Butan-2-ol (CH₃CHOHCH₂CH₃)**: Can be oxidized to a methyl ketone (CH₃COCH₃), so it will give a positive test.
- **Propan-2-ol (CH₃CHOHCH₃)**: Can also be oxidized to a methyl ketone (CH₃COCH₃), so it will give a positive test.
- **Ethyl methyl ketone (CH₃C(O)CH₂CH₃)**: Contains a methyl ketone structure, so it will give a positive test.

4. **Conclusion**:
- The compounds that give a positive iodoform test when reacted with hypoiodite (IO⁻) are:
- Acetone (CH₃COCH₃)
- Butan-2-ol (CH₃CHOHCH₂CH₃)
- Propan-2-ol (CH₃CHOHCH₃)
- Ethyl methyl ketone (CH₃C(O)CH₂CH₃)

### Final Answer:
- The compounds that give a positive iodoform test are Acetone, Butan-2-ol, Propan-2-ol, and Ethyl methyl ketone.