Assertion. Propene reacts with hydrogen chloride in presence of organic peroxide to give 1-chloropropane
Reason. Addition of HCl follows Kharasch effect

Options

A. If both assertion and reason are true, and reason is the true explanation of the assertion.
B. If both assertion and reason are true, but reason is not the true explanation of the 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 the assertion and reason provided.

### Step-by-Step Solution:

1. **Understanding the Assertion**:
- The assertion states that propene reacts with hydrogen chloride (HCl) in the presence of organic peroxide to give 1-chloropropane.
- Propene (C3H6) has the structure CH2=CH-CH3. When it reacts with HCl, we expect the addition of H and Cl across the double bond.

2. **Reaction Mechanism**:
- In the presence of organic peroxides (like H2O2), the addition of HCl to alkenes follows a different mechanism compared to the absence of peroxides.
- Normally, HCl adds to alkenes following Markovnikov's rule, where the hydrogen atom attaches to the carbon with more hydrogen atoms, leading to the formation of a more stable carbocation.

3. **Kharasch Effect**:
- The Kharasch effect states that in the presence of peroxides, the addition of HCl to alkenes occurs via an anti-Markovnikov pathway.
- This means that the Cl atom will attach to the less substituted carbon (the primary carbon in the case of propene), leading to the formation of 2-chloropropane instead of 1-chloropropane.

4. **Conclusion on Assertion**:
- Since the assertion claims that the product is 1-chloropropane, which is incorrect, the assertion is false.

5. **Conclusion on Reason**:
- The reason states that the addition of HCl follows the Kharasch effect, which is true. However, it does not support the assertion because the product formed is 2-chloropropane, not 1-chloropropane.

### Final Evaluation:
- The assertion is false, and the reason is true. Therefore, the correct answer is that the assertion is incorrect, and the reason is correct.