On catalytic hydrogenation how many isomeric alkene will give 2 methyl butane.

Answer

To determine how many isomeric alkenes can yield 2-methylbutane upon catalytic hydrogenation, we will follow these steps:

### Step 1: Understand the Structure of 2-Methylbutane
2-Methylbutane has the following structure:
- It is a branched alkane with a total of 5 carbon atoms.
- The structure can be represented as:
```
CH3
|
CH3-CH-CH2-CH3
```

### Step 2: Identify Possible Isomeric Alkenes
We need to identify the alkenes that can be hydrogenated to form 2-methylbutane. The double bond can be located in different positions, leading to different isomers.

1. **2-Methylbut-1-ene**:
- Structure:
```
CH3
|
CH3-CH=CH-CH3
```

2. **2-Methylbut-2-ene**:
- Structure:
```
CH3
|
CH3-C=CH-CH3
```

3. **3-Methylbut-1-ene**:
- Structure:
```
CH3
|
CH2=CH-CH2-CH3
```

### Step 3: Count the Isomeric Alkenes
From the structures identified:
- 2-Methylbut-1-ene
- 2-Methylbut-2-ene
- 3-Methylbut-1-ene

Thus, there are **3 isomeric alkenes** that can yield 2-methylbutane upon catalytic hydrogenation.

### Final Answer
The number of isomeric alkenes that can give 2-methylbutane on catalytic hydrogenation is **3**.

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