Write condensed and bond line structural formulae for all the possible isomers of molecular formula `C_(4)H_(6)`.

Explanation

To find all the possible isomers of the molecular formula \( C_4H_6 \), we will consider both structural and geometric isomers. The degree of unsaturation (DU) can help us determine the types of isomers we can create.

### Step 1: Calculate the Degree of Unsaturation
The degree of unsaturation (DU) can be calculated using the formula:
\[ DU = \frac{(2C + 2 - H)}{2} \]
For \( C_4H_6 \):
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