What is the general molecular formula for alkenes?

Alkenes are unsaturated hydrocarbons that contain at least one carbon-carbon double bond.

For an aliphatic, non-cyclic alkene with one double bond, the general molecular formula is $\text{C}_n\text{H}_{2n}$, where $n$ is the number of carbon atoms.

$\text{C}_n\text{H}_{2n+2}$ is the general formula for alkanes.

$\text{C}_n\text{H}_{2n-2}$ is the general formula for alkynes.

Answer: $\text{C}_n\text{H}_{2n}$