Among the following the one that gives positive iodoform test upon reaction with `l_(2)` and `NaOH` is

Options

A. `CH_(3)CH_(2)CH(OH)CH_(2)CH_(3)`
B. `C_(6)H_(5)CH_(2)CH_(2)OH`
C. `PhCHOHCH_(3)`
D. `CH_(3)CH(CH_(2)OH)CH_(3)`

Answer

To determine which of the given alcohols gives a positive iodoform test upon reaction with iodine (I₂) and sodium hydroxide (NaOH), we need to identify the presence of the acetyl group (CH₃CO-) in the structure of the alcohols. The iodoform test is specifically used to detect methyl ketones or secondary alcohols that can be oxidized to methyl ketones.

### Step-by-Step Solution:

1. **Identify the Alcohols**: List the alcohols provided in the question. For the sake of this solution, let's assume the alcohols are:
- A) CH₃CH₂CHOHCH₂CH₃
- B) C₆H₅CH₂CH₂OH
- C) C₆H₅CH(OH)CH₃
- D) CH₃CH(OH)CH₂CH₃

2. **Analyze Each Alcohol**:
- **Alcohol A (CH₃CH₂CHOHCH₂CH₃)**:
- This is a primary alcohol. Upon oxidation, it forms an aldehyde (CH₃CH₂CHO), which does not have a methyl ketone structure. Therefore, it will **not** give a positive iodoform test.

- **Alcohol B (C₆H₅CH₂CH₂OH)**:
- This is also a primary alcohol. Oxidation leads to an aldehyde (C₆H₅CH₂CHO), which again does not have a methyl ketone structure. Therefore, it will **not** give a positive iodoform test.

- **Alcohol C (C₆H₅CH(OH)CH₃)**:
- This is a secondary alcohol. Upon oxidation, it forms a ketone (C₆H₅COCH₃), which contains the methyl ketone structure (CH₃CO-). Therefore, it **will** give a positive iodoform test.

- **Alcohol D (CH₃CH(OH)CH₂CH₃)**:
- This is also a secondary alcohol. Upon oxidation, it forms a ketone (CH₃COCH₂CH₃), which also contains the methyl ketone structure (CH₃CO-). Therefore, it **will** give a positive iodoform test.

3. **Conclusion**:
- Among the given options, both Alcohol C and Alcohol D can give a positive iodoform test. However, if we are to select the one that is most commonly recognized for this test, we would choose **Alcohol C (C₆H₅CH(OH)CH₃)**, as it is a classic example of a secondary alcohol that gives a positive iodoform test.

### Final Answer:
The alcohol that gives a positive iodoform test is **C) C₆H₅CH(OH)CH₃**.