The dehydration of 2-methyl butanol with conc. `H_(2)SO_(4)` gives

Options

A. 2-methyl butene as major product
B. Pentene
C. 2-methyl but-2-ene as major product
D. 2-methyl pent-2-ene

Explanation

To solve the question regarding the dehydration of 2-methyl butanol with concentrated sulfuric acid (H₂SO₄), we will follow these steps:

### Step 1: Identify the structure of 2-methyl butanol
2-methyl butanol is an alcohol with the following structure:
- It has four carbon atoms in the main chain (butanol).
- A methyl group is attached to the second carbon.

The structure can be represented as:
```
CH3
|
CH3-CH-CH2-CH3
|
OH
```

### Step 2: Understand the dehydration process
Dehydration of alcohols involves the removal of a water molecule (H₂O) to form an alkene. In this case, concentrated sulfuric acid acts as a dehydrating agent.

### Step 3: Protonation of the alcohol
The first step in the dehydration process is the protonation of the hydroxyl (-OH) group by the concentrated sulfuric acid. This converts the -OH group into a better leaving group (water).

The reaction can be represented as:
```
2-methyl butanol + H₂SO₄ → Protonated alcohol (oxonium ion)
```

### Step 4: Formation of the carbocation
After protonation, the -OH group leaves as water, forming a carbocation. In this case, the carbocation is formed at the second carbon (C-2).

### Step 5: Elimination of a beta-hydrogen
The next step is the elimination of a beta-hydrogen from the adjacent carbon atoms (C-1 or C-3). This results in the formation of a double bond.

### Step 6: Determine the major product
In this case, two possible alkenes can be formed:
1. From the elimination of a hydrogen from C-1, we get 2-methyl-1-butene.
2. From the elimination of a hydrogen from C-3, we get 2-methyl-2-butene.

However, according to Zaitsev's rule, the more substituted alkene (more stable) is favored. Therefore, 2-methyl-2-butene, which is more substituted, will be the major product.

### Final Answer
The dehydration of 2-methyl butanol with concentrated H₂SO₄ gives 2-methyl-2-butene as the major product.

---