Acid-catalyzed mechanism of given aldol reaction.
`2CH_(3)-overset(O)overset(||)C-CH_(3) overset(HCl) to CH_(3)-overset(O)overset(|)C-CH=overset(CH_(3))overset(|)C-CH_(3)+H_(2)O`

Explanation

To understand the acid-catalyzed mechanism of the given aldol reaction, let's break it down into clear steps:

### Step 1: Tautomerization
- **Description**: The first step involves the tautomerization of the ketone. The ketone (CH₃C(=O)CH₂CH₃) undergoes tautomerization to form an enol. This process involves the relocation of a hydrogen atom from the alpha carbon (the carbon adjacent to the carbonyl group) to the oxygen atom of the carbonyl group.
- **Chemical Equation**:
\[ CH₃C(=O)CH₂CH₃ \rightarrow CH₃C(=C(OH)CH₃) \text{ (enol)} \]
...