Assertion : Alkenes are reactive than alkanes.
Reason : Alkene contains double bonds.

Options

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

Answer

### Step-by-Step Text Solution

1. **Understanding the Assertion**: The assertion states that "Alkenes are more reactive than alkanes." To analyze this, we need to understand the structural differences between alkenes and alkanes.

2. **Defining Alkenes and Alkanes**:
- Alkenes are hydrocarbons that contain at least one carbon-carbon double bond (C=C).
- Alkanes are hydrocarbons that contain only single carbon-carbon bonds (C-C).

3. **Analyzing Reactivity**:
- The reactivity of a compound is often influenced by the type of bonds present. In alkenes, the presence of a double bond (which consists of one sigma bond and one pi bond) plays a crucial role in their reactivity.
- In contrast, alkanes only have single bonds, which are generally stronger and more stable.

4. **Understanding Bond Strength**:
- The double bond in alkenes consists of a strong sigma bond and a weaker pi bond. The pi bond is formed by the sidewise overlap of p-orbitals and is more exposed and less stable than a sigma bond.
- The presence of this weaker pi bond makes alkenes more susceptible to reactions, such as addition reactions, where the double bond can be broken to form new bonds.

5. **Evaluating the Reason**: The reason provided states that "Alkenes contain double bonds." This is a true statement and directly relates to the assertion. The presence of double bonds is indeed what contributes to the increased reactivity of alkenes compared to alkanes.

6. **Conclusion**: Both the assertion and the reason are correct. The reason correctly explains why alkenes are more reactive than alkanes, making the assertion valid.

### Final Answer:
Both the assertion and the reason are correct, and the reason is a correct explanation of the assertion.