Write a chemical reaction to illustrate Saytzeff's rule.

Explanation

To illustrate Saytzeff's rule, we can consider the dehydrohalogenation reaction of 2-bromobutane. Saytzeff's rule states that in the elimination reaction, the more substituted alkene will be the major product.

### Step-by-Step Solution:

1. **Identify the Reactant**:
We will use 2-bromobutane (C4H9Br) as our starting material.

2. **Understand the Reaction**:
...