Total number of isomers considering both structural and stereoisomers, of cyclic ethers with the molecular formula `C_(4)H_(8)O` is _________

Explanation

To find the total number of isomers (both structural and stereoisomers) of cyclic ethers with the molecular formula C₄H₈O, we can follow these steps:

### Step 1: Determine the Degree of Unsaturation (DOU)
The formula for calculating the degree of unsaturation (DOU) is:
\[ \text{DOU} = \frac{2C + 2 + N - H - X}{2} \]
Where:
- C = number of carbon atoms
- H = number of hydrogen atoms
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