A compound X (having vinegar like smell) when treated with ethanol in the presence of the acid Z, gives a compound Y which has a fruity smell. The reaction is :
`C_2H_5OH + X overset(Z)to Y+H_2O`
Write the structural formula of X.

Explanation

To solve the problem, we need to identify the compound X that has a vinegar-like smell and reacts with ethanol in the presence of an acid Z to produce a compound Y with a fruity smell.

### Step-by-Step Solution:

1. **Identify the Characteristics of Compound X**:
- The question states that compound X has a vinegar-like smell. This is characteristic of acetic acid, also known as ethanoic acid.

2. **Determine the Structure of Compound X**:
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