Hydration of 3-phenylbut-1-ene in dil `H_(2)So_(4)` will give mainly :

Answer

To solve the problem of determining the main product of the hydration of 3-phenylbut-1-ene in dilute H2SO4, we can follow these steps:

### Step-by-Step Solution:

1. **Draw the Structure of 3-Phenylbut-1-ene**:
- The compound has a butene structure with a phenyl group (C6H5) attached to the third carbon.
- The structure can be represented as follows:
```
CH2=CH-CH(C6H5)-CH3
```

2. **Identify the Reaction Conditions**:
- The reaction is performed in the presence of dilute sulfuric acid (H2SO4), which provides H+ ions for the hydration process.

3. **Formation of Carbocation**:
- The double bond between the first two carbons will break, and a hydrogen ion (H+) will add to one of the carbons, leading to the formation of a carbocation.
- The possible carbocations formed are:
- A primary carbocation at C1 (less stable)
- A secondary carbocation at C2 (more stable)
- The more stable secondary carbocation will be favored:
```
CH3-CH+-CH(C6H5)-CH3
```

4. **Carbocation Rearrangement**:
- Since we have a secondary carbocation, it can undergo rearrangement to form a more stable tertiary carbocation.
- A hydride shift occurs from the adjacent carbon (C2) to the carbocation (C3), resulting in:
```
CH3-CH2-C+(C6H5)-CH3
```

5. **Final Product Formation**:
- After the rearrangement, the carbocation can react with water (from the dilute H2SO4) to form the alcohol.
- The hydroxyl group (OH) will attach to the carbon with the positive charge:
```
CH3-CH2-C(C6H5)(OH)-CH3
```

6. **Identify the Major Product**:
- The final product of the hydration reaction will be:
```
3-Phenylbutan-2-ol
```
- This compound is the major product due to the stability of the tertiary carbocation formed during the reaction.

### Final Answer:
The main product of the hydration of 3-phenylbut-1-ene in dilute H2SO4 is **3-phenylbutan-2-ol**.