Which of the following alcohols will show positive iodoform test?

Options

A. `CH_(3)-overset(OH)overset(|)(CH)-CH_(2)-NO_(2)`
B. `CH_(3)-overset(OH)overset(|)(CH)-CH_(2)-overset(O)overset(||)(C)-OH`
C. `ICH_(2)-overset(OH)overset(|)(CH)-CH_(2)CH_(3)`
D. None of these

Explanation

To determine which alcohols will show a positive iodoform test, we need to understand the requirements for this test. The iodoform test is used to identify the presence of a methyl ketone (RCOCH3) or a secondary alcohol that can be oxidized to a methyl ketone. The test involves the reaction of the alcohol with iodine and sodium hydroxide (NaOH), resulting in the formation of a yellow precipitate of iodoform (CHI3) if the test is positive.

### Step-by-Step Solution:

1. **Understand the Iodoform Test**:
- The iodoform test is a qualitative test used to identify methyl ketones (RCOCH3) or secondary alcohols that can be oxidized to methyl ketones.
- The reaction involves iodine (I2) and sodium hydroxide (NaOH), which leads to the formation of a yellow precipitate of iodoform (CHI3) if the test is positive.

2. **Identify the Structure of Alcohols**:
- Analyze the structures of the given alcohols (let's assume we have five options: A, B, C, D, and E).
- Look for the presence of the functional groups that can lead to a positive iodoform test, specifically the methyl ketone structure or secondary alcohols that can be oxidized to a methyl ketone.

3. **Evaluate Each Alcohol**:
- For each alcohol, check if it has:
- A methyl group adjacent to the hydroxyl group (for secondary alcohols).
- A structure that can be oxidized to a methyl ketone.
- Alcohol A: Check if it has the required structure.
- Alcohol B: Check if it has the required structure.
- Alcohol C: Check if it has the required structure.
- Alcohol D: Check if it has the required structure.
- Alcohol E: Check if it has the required structure.

4. **Determine Positive or Negative Test**:
- If an alcohol has the required structure, it will give a positive iodoform test, resulting in a yellow precipitate.
- If it does not have the required structure, it will give a negative test.

5. **Conclusion**:
- After evaluating all options, identify which alcohol(s) showed a positive iodoform test based on the presence of the methyl ketone or secondary alcohol structure.

### Final Answer:
- The correct alcohol that shows a positive iodoform test is **Option C**.