Assertion:2-Bromobutane on reaction with sodium ethoxide in ethanol gives 1-butene as a major product
Reason:1-butene is more stable than 2-butene.

Options

A. If both assertion and reason are true and reason is the explaination of assertion.
B. If both assertion and reason are true but reason is not the correct explaination of assertion
C. If assertion is true but reason is false
D. If both assertion and reason are false.

Explanation

To solve the question, we need to analyze both the assertion and the reason provided.

### Step-by-Step Solution:

1. **Understanding the Assertion**:
The assertion states that 2-bromobutane reacts with sodium ethoxide in ethanol to give 1-butene as the major product.
- **Chemical Reaction**: The reaction involves the elimination of bromine and the formation of a double bond.
- **Expected Product**: Typically, we would expect that the elimination reaction would lead to the formation of an alkene.

2. **Analyzing the Reaction**:
In this case, the reaction is not a simple elimination but rather a reaction that could lead to ether formation (Williamson's synthesis).
- **Williamson's Ether Synthesis**: This reaction typically involves the formation of ethers rather than alkenes when using sodium ethoxide in ethanol.
- **Conclusion**: Therefore, the assertion that 2-bromobutane gives 1-butene as a major product is incorrect.

3. **Understanding the Reason**:
The reason states that 1-butene is more stable than 2-butene.
- **Stability of Alkenes**: According to the Zaitsev's rule, more substituted alkenes are generally more stable than less substituted ones.
- **Comparison**: 2-butene is more substituted than 1-butene, which makes it more stable.
- **Conclusion**: Hence, the reason that 1-butene is more stable than 2-butene is also incorrect.

4. **Final Conclusion**:
Since both the assertion and the reason are false, we can conclude that the correct answer is option D, which states that both the assertion and reason are false.