`Aoverset(H_(3)O^(+))(to)B+EtOH`
`Boverset(Delta)(to)` Acetone
A is :

Options

A.
B.
C.
D.

Answer

To solve the problem, we need to identify the compound A that can undergo hydrolysis to form compound B in the presence of hydronium ion (H₃O⁺) and then convert B to acetone upon heating.

### Step-by-Step Solution:

1. **Identify the Reaction Sequence**:
- A reacts with H₃O⁺ to form B + EtOH (ethyl alcohol).
- B is then heated to form acetone.

2. **Analyze the Hydrolysis Reaction**:
- Hydrolysis typically involves the addition of water or a hydronium ion, leading to the formation of alcohols and other products.
- The presence of EtOH suggests that B must have a structure that can yield ethyl alcohol upon hydrolysis.

3. **Examine Possible Structures for A**:
- We need to consider structures that can produce an alcohol and a carbonyl compound upon hydrolysis.
- A common structure that fits this description is an ester or a ketone.

4. **Check Each Option**:
- **Option 1**: If A is an ester, hydrolysis would yield an alcohol and a carboxylic acid. However, we need to ensure that the product B can be converted to acetone.
- **Option 2**: If A is a compound like an acid anhydride or a specific ester that can yield a ketone upon heating, we should analyze if it can yield B and then acetone.

5. **Determine the Structure of B**:
- From the hydrolysis reaction, B must be a compound that can be heated to yield acetone.
- If B is a β-keto ester or a similar compound, it can undergo decarboxylation or elimination to form acetone.

6. **Final Verification**:
- After testing the structures, if we find that the second option leads to the formation of acetone upon heating, we can conclude that A is the correct structure.

### Conclusion:
The correct structure of A is the one that, upon hydrolysis, yields B (which can then be heated to form acetone). Based on the analysis, the second option is the correct answer.