Which of the following is a saturated hydrocarbon?

Explanation

A saturated hydrocarbon contains only single carbon to carbon bonds and therefore holds the maximum possible number of hydrogen atoms, which is true of ethane and of the alkanes generally. Ethene has a double bond, ethyne a triple bond and benzene a delocalised system, so all three are unsaturated. Unsaturation is detected in the laboratory by the decolourising of bromine water.