In the reaction sequence `CH_(3)-CO-CH_(3)overset(C_(2)H_(5)OH//OH^(-))rarr(A) overset(C_(2)H_(5)OH//H^(+))rarr[X]` will be

Options

A.
B.
C.
D.

Answer

To solve the problem, we will go through the reaction sequence step by step:

1. **Identify the starting compound**: The starting compound is CH₃COCH₃, which is acetone (a ketone).

2. **First reaction with C₂H₅OH and OH⁻**:
- In the presence of ethanol (C₂H₅OH) and hydroxide ion (OH⁻), the hydroxide ion will act as a nucleophile and attack the carbonyl carbon of acetone.
- This results in the formation of a tetrahedral intermediate, which can be represented as:
\[ CH₃C(OH)(C₂H₅)CH₃ \]
- After the nucleophilic attack, the intermediate will rearrange to form a hemiketal:
\[ A: CH₃C(OC₂H₅)(OH)CH₃ \]

3. **Second reaction with C₂H₅OH and H⁺**:
- The hemiketal (A) formed in the first step will now react with ethanol in the presence of an acid (H⁺).
- The protonation of the hydroxyl group (OH) will make it a better leaving group (water).
- The ethanol will then attack the carbon that was previously part of the carbonyl group, leading to the formation of a ketal.
- The final product (X) can be represented as:
\[ X: CH₃C(OC₂H₅)₂CH₃ \]

4. **Conclusion**: The final product X is a ketal formed from the reaction of acetone with ethanol.

### Summary of the Reaction Sequence:
- Starting compound: Acetone (CH₃COCH₃)
- Intermediate A: Hemiketal (CH₃C(OC₂H₅)(OH)CH₃)
- Final product X: Ketal (CH₃C(OC₂H₅)₂CH₃)

### Final Answer:
The compound X is a ketal derived from acetone and ethanol.

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