2-Phenylbutan-2-ol can be prepared by which of the following combinations ?

Options

A. `C_(6)H_(5)COCH_(3)+C_(2)H_(5)MgBr`
B. `C_(2)H_(5)COCH_(3)+C_(6)H_(5)MgBr`
C. `C_(6)H_(5)COC_(2)H_(5)+CH_(3)MgBr`
D. All of these

Explanation

To prepare 2-Phenylbutan-2-ol, we can use various combinations of reactants. Let's analyze the possible combinations step by step.

### Step-by-Step Solution:

1. **Identify the Structure of 2-Phenylbutan-2-ol**:
- The molecular structure of 2-Phenylbutan-2-ol consists of a butane chain with a phenyl group (C6H5) and a hydroxyl group (OH) attached to the second carbon.
- The structure can be represented as follows:
```
OH
|
C6H5-C-CH2-CH3
|
CH3
```

2. **Consider the Reactants**:
- The reactants provided in the question include:
- C6H5COCH3 (acetophenone)
- C2H5MgBr (ethylmagnesium bromide)
- C6H5COC2H5 (ethyl phenyl ketone)
- CH3MgBr (methylmagnesium bromide)

3. **Reaction with Grignard Reagents**:
- Grignard reagents (like C2H5MgBr and CH3MgBr) react with carbonyl compounds to form alcohols.
- For example, when acetophenone (C6H5COCH3) reacts with C2H5MgBr, it forms an intermediate alcohol which can be further treated to yield 2-Phenylbutan-2-ol.

4. **Formation of the Alcohol**:
- The general reaction can be summarized as:
```
C6H5COCH3 + C2H5MgBr → C6H5C(OH)(C2H5)(CH3) + MgBr(OH)
```
- This reaction results in the formation of 2-Phenylbutan-2-ol after hydrolysis.

5. **Check Other Combinations**:
- Similarly, if we take C6H5COC2H5 and react it with CH3MgBr, we can also arrive at 2-Phenylbutan-2-ol.
- The same process applies to the other combinations provided in the question.

6. **Conclusion**:
- All the combinations provided can lead to the formation of 2-Phenylbutan-2-ol through the reaction of the carbonyl compounds with the respective Grignard reagents followed by hydrolysis.

### Final Answer:
- The answer is that 2-Phenylbutan-2-ol can be prepared by **all of the provided combinations**.