## Chemistry: The Central Science (13th Edition)

$C_{4}H_{6}$ is not a saturated hydrocarbon.
$C_{4}H_{6}$ is an unsaturated hydrocarbon. It has two C=C bonds. Saturated hydrocarbons obey the general formula $C_{n}H_{2n}+2$, thus it should be $C_{4}H_{10}$.