Following compounds are given
(a) `CH_(3)CH_(2)OH` , (b) `CH_(3)COCH_(3)`
(C )`CH_(3)CH(OH)CH_(3)` , (d) `CH_(3)OH`
Which of the above compound `(s)`, on being warmed with iodine solution and `NaOH`, will give iodoform?

Options

A. Only (b)
B. (a), (b) and (c )
C. (a) and (b)
D. (a), (c ) and (d)

Answer

To determine which of the given compounds will give a positive iodoform test when warmed with iodine solution and NaOH, we need to identify the presence of a methyl ketone (RCOCH3) or a secondary alcohol with a methyl group adjacent to the hydroxyl group (RCHOHCH3).

Let's analyze each compound step by step:

1. **Compound (a): CH₃CH₂OH (Ethanol)**
- Ethanol is a primary alcohol.
- It does not have a carbonyl group (C=O) or a methyl group adjacent to the hydroxyl group.
- **Conclusion**: Ethanol will NOT give an iodoform test.

2. **Compound (b): CH₃COCH₃ (Acetone)**
- Acetone is a ketone with the structure CH₃C(=O)CH₃.
- It has a carbonyl group (C=O) and two methyl groups (CH₃) adjacent to it.
- **Conclusion**: Acetone WILL give an iodoform test.

3. **Compound (c): CH₃CHOHCH₃ (Isopropanol)**
- Isopropanol is a secondary alcohol with the structure CH₃C(OH)CH₃.
- It has a hydroxyl group (OH) and a methyl group adjacent to it.
- **Conclusion**: Isopropanol WILL give an iodoform test.

4. **Compound (d): CH₃OH (Methanol)**
- Methanol is a primary alcohol.
- It does not have a carbonyl group or any beta hydrogens.
- **Conclusion**: Methanol will NOT give an iodoform test.

### Final Answer:
The compounds that will give the iodoform test are:
- (b) CH₃COCH₃ (Acetone)
- (c) CH₃CHOHCH₃ (Isopropanol)

### Summary:
- Compounds (b) and (c) give a positive iodoform test.
- Compounds (a) and (d) do not give a positive iodoform test.