# Question #fb914

$C {H}_{4}$
Alkanes have the general formula ${C}_{n} {H}_{n + 2}$, Alkenes have formula ${C}_{n} {H}_{n}$. The MASS ratio of H:C is 1:12, so the 1:3 mass ratio in the compound requires four times as many H atoms as C atoms. The simplest alkane will do: $C {H}_{4}$.