Racemisation increases with :

Options

A. Increases in stability of carbocation
B. increases in basicity of leaving group
C. increases in solvent polarity
D. increses in activation energy of rate determining step (rds)

Explanation

To solve the question regarding the factors that increase racemization, we can break down the concepts step by step:

### Step-by-Step Solution:

1. **Understanding Racemization**:
- Racemization is the process where an optically active compound (which can rotate plane-polarized light) converts into a racemic mixture (which has equal amounts of both enantiomers and does not rotate plane-polarized light).
- This process can occur through various means, including heat or chemical reactions.

2. **Factors Affecting Racemization**:
- The question asks what conditions lead to an increase in racemization. We need to consider factors that can stabilize the transition state or intermediates involved in the racemization process.

3. **Solvent Polarity**:
- One of the key factors that can increase racemization is the polarity of the solvent.
- When solvent polarity increases, it stabilizes the carbocation intermediate that may form during the racemization process. A more stable carbocation has a longer lifetime, which allows for more effective interaction with the nucleophile from both sides, leading to racemization.

4. **Stability of Carbocation**:
- Increased stability of the carbocation also facilitates racemization. A stable carbocation can exist longer and allows for the attack from both enantiomeric forms, thus increasing the chances of racemization.

5. **Ion Pair Interaction**:
- Higher solvent polarity can decrease ion pair interactions, which can also contribute to an increase in racemization. Reduced ion pairing allows for more freedom of movement for the ions involved, promoting racemization.

6. **Conclusion**:
- Based on the above analysis, we can conclude that racemization increases with:
- **Increase in solvent polarity**
- **Increase in stability of carbocation**

### Final Answer:
Racemization increases with:
- **Increase in solvent polarity**
- **Increase in stability of carbocation**