Given-below are two statements: one is labelled asAssertion A and the other is labelledasReason R:
Assertion A:Acetal / Ketal is stable in basic medium.
Reason R:The high leaving tendencyof alkoxide ion gives the stability to acetal / ketal in basic medium.The high leaving tendency of alkoxide ion givesthe stability to acetal / ketal in basic medium.
In the light of the above statements, choose the correct answer from the options given below:

Options

A. Both A and R are true but R is NOT the correct explanation of A
B. A is false but R is true
C. A is true but R is false
D. Both A and R are true and R is the correct explanation of A

Answer

To analyze the statements provided in the question, we will break down the Assertion (A) and Reason (R) step by step.

### Step 1: Understanding the Assertion
**Assertion A:** Acetal/Ketal is stable in basic medium.

- Acetals and ketals are formed from the reaction of aldehydes or ketones with alcohols in the presence of an acid catalyst.
- In a basic medium, acetals and ketals can be hydrolyzed back to their parent carbonyl compounds. However, they are generally more stable in neutral or slightly acidic conditions.
- Therefore, the assertion that acetals/ketals are stable in basic medium is **not entirely accurate**.

### Step 2: Understanding the Reason
**Reason R:** The high leaving tendency of alkoxide ion gives the stability to acetal/ketal in basic medium.

- Alkoxides are the conjugate bases of alcohols and can act as good leaving groups.
- In a basic medium, the presence of alkoxide ions can lead to the breakdown of acetals and ketals, rather than stabilizing them.
- The reason provided does not support the assertion; instead, it contradicts it because the presence of a strong base would typically lead to the hydrolysis of acetals and ketals.

### Step 3: Conclusion
- Since the assertion is incorrect (acetals/ketals are not stable in basic medium) and the reason does not correctly explain or support the assertion, we conclude that both statements are false.

### Final Answer:
Both Assertion A and Reason R are incorrect.

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