An acid of molecular formula, `C_(5)H_(10)O_(2)` is optically active. What is its structure?

Explanation

To determine the structure of an acid with the molecular formula \( C_5H_{10}O_2 \) that is optically active, we can follow these steps:

### Step 1: Determine the Degree of Unsaturation
First, we need to calculate the degree of unsaturation (DU) for the given molecular formula. The formula for calculating the degree of unsaturation is:

\[ DU = C + 1 - \frac{H}{2} \]
...