A : Alkynes is more reactive than alkene towards electrophilic addition reaction.
R : Alkynes form stable carbocation than alkene.

Options

A. If both Assertion & Reason are true and the reason is the correct explanation of the assertion, then mark (1).
B. If both Assertion & Reason are true but the reason is not the correct explanation of the assertion, then mark (2)
C. if Assertion is true statement but Reason is false, then mark (3)
D. If both Assertion and Reason are false statements, then mark (4)

Answer

To solve the assertion-reason question regarding the reactivity of alkynes and alkenes towards electrophilic addition reactions, we will analyze both the assertion (A) and the reason (R) step by step.

### Step 1: Analyze the Assertion (A)
**Assertion (A):** Alkynes are more reactive than alkenes towards electrophilic addition reactions.

- **Explanation:** Alkynes contain a triple bond (C≡C), which consists of one sigma bond and two pi bonds. The presence of multiple pi bonds makes alkynes more reactive in electrophilic addition reactions compared to alkenes, which only have one pi bond (C=C). The greater number of pi bonds in alkynes allows for more sites of reaction with electrophiles, thus making them more reactive.

### Step 2: Analyze the Reason (R)
**Reason (R):** Alkynes form more stable carbocations than alkenes.

- **Explanation:** When considering the stability of carbocations, we note that the stability of a carbocation increases with the degree of substitution. Alkenes typically form sp² hybridized carbocations, which are less stable than sp³ hybridized carbocations formed from alkynes. However, the assertion that alkynes form more stable carbocations than alkenes is incorrect. In fact, alkenes form more stable carbocations due to the greater electron-donating ability of alkyl groups attached to the positively charged carbon.

### Step 3: Conclusion
- **Final Evaluation:**
- The assertion (A) is **true**: Alkynes are indeed more reactive than alkenes towards electrophilic addition reactions.
- The reason (R) is **false**: Alkynes do not form more stable carbocations than alkenes; in fact, alkenes form more stable carbocations.

### Answer:
Both the assertion (A) is true, but the reason (R) is false. Therefore, the correct conclusion is that the assertion is true, but the reason is not a correct explanation of the assertion.

---