How many isomeric structural alkene on catalytic hydrogenation gives `3`-Methyl hexane.

Options

A. `3`
B. `4`
C. `5`
D. `6`

Explanation

To determine how many isomeric structural alkenes can yield 3-methylhexane upon catalytic hydrogenation, we can follow these steps:

### Step 1: Understand the structure of 3-methylhexane
3-methylhexane has a total of 6 carbon atoms in the main chain (hexane) and a methyl group (–CH₃) attached to the third carbon. The structural formula can be represented as follows:

```
CH₃
|
CH₃-CH-CH₂-CH₂-CH₃
```

### Step 2: Identify the possible alkenes
To find the alkenes that can yield 3-methylhexane upon hydrogenation, we need to consider the positions of the double bonds in the carbon chain.

### Step 3: Draw the alkenes
1. **Alkene 1**: Place a double bond between C1 and C2.
- Structure: CH₂=CH-CH(CH₃)-CH₂-CH₂-CH₃

2. **Alkene 2**: Place a double bond between C2 and C3.
- Structure: CH₃-CH=CH(CH₃)-CH₂-CH₂-CH₃

3. **Alkene 3**: Place a double bond between C3 and C4.
- Structure: CH₃-CH₂-CH=CH-CH₂-CH₃

4. **Alkene 4**: Place a double bond between C4 and C5.
- Structure: CH₃-CH₂-CH₂-CH=CH-CH₃

5. **Alkene 5**: Place a double bond between C1 and C6 (terminal alkene).
- Structure: CH₂=CH-CH₂-CH₂-CH(CH₃)-CH₃

### Step 4: Count the isomers
After identifying the alkenes, we find that there are a total of **5 distinct isomeric structural alkenes** that can be hydrogenated to form 3-methylhexane.

### Final Answer
Thus, the total number of isomeric structural alkenes that give 3-methylhexane upon catalytic hydrogenation is **5**.

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