The compound 2-methylpropene, $\text{C}_4\text{H}_8$, is a monomer that is used to make synthetic rubber. Besides 2-methylpropene, there are $x$ further isomers of $\text{C}_4\text{H}_8$, whether structural or other types, that contain a double bond. Determine the value of $x$.
- A1
- B2
- C3
- D4