2-Methylbutan -2-ol can be obtained by the acid catalyzed hydration of

Options

A. `CH_3CH_2CH=CH_2`
B. `CH_3CH=CHCH_2`
C. `(CH_3)_2C=CHCH_3`
D. Either of the three

Answer

To determine the compound from which 2-Methylbutan-2-ol can be obtained via acid-catalyzed hydration, we need to follow these steps:

### Step 1: Identify the Structure of 2-Methylbutan-2-ol
2-Methylbutan-2-ol has a four-carbon main chain with a hydroxyl (OH) group on the second carbon and a methyl (CH3) group also on the second carbon. The structure can be represented as:
```
CH3
|
CH3-CH-CH2-CH3
|
OH
```

### Step 2: Understand Acid-Catalyzed Hydration
Acid-catalyzed hydration involves the addition of water (H2O) across a double bond in the presence of an acid (H+). The reaction typically follows Markovnikov's rule, where the hydrogen atom from the water will attach to the carbon with more hydrogen atoms, leading to the formation of a more stable carbocation.

### Step 3: Identify Possible Alkenes
To form 2-Methylbutan-2-ol through hydration, we need to identify an alkene that can yield this alcohol. The alkene must have the structure that, when hydrated, will produce the desired alcohol.

### Step 4: Analyze the Options
We need to analyze potential alkenes that can be hydrated to form 2-Methylbutan-2-ol.

1. **Option 1:** CH3-CH2-CH=CH2 (But-1-ene)
- Hydration would yield 2-butanol, not 2-Methylbutan-2-ol.

2. **Option 2:** CH3-CH=CH-CH3 (But-2-ene)
- Hydration would yield 2-Methylbutan-2-ol, as the addition of water across the double bond would lead to the formation of the desired product.

3. **Option 3:** CH3-CH2-CH2-CH=CH2 (Pent-1-ene)
- Hydration would yield 2-pentanol, not 2-Methylbutan-2-ol.

4. **Option 4:** CH3-CH=CH2 (Propene)
- Hydration would yield 2-propanol, not 2-Methylbutan-2-ol.

### Step 5: Conclusion
The only alkene that can be hydrated to yield 2-Methylbutan-2-ol is But-2-ene (Option 2). Therefore, the answer is:

**2-Methylbutan-2-ol can be obtained by the acid-catalyzed hydration of But-2-ene.**

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