The thermal cracking of one mole of pentadecane (C15H32\text{C}_{15}\text{H}_{32}C15H32) produces one mole of octane (C8H18\text{C}_8\text{H}_{18}C8H18), alongside propene (C3H6\text{C}_3\text{H}_6C3H6) and ethene (C2H4\text{C}_2\text{H}_4C2H4) as illustrated in the reaction scheme below:
Which of the following statements is correct regarding the hydrocarbons involved and their molar ratios in this reaction?
Ethene is a saturated hydrocarbon and the molar ratio of propene to ethene produced is 1:21 : 21:2.
Propene is an unsaturated hydrocarbon and the molar ratio of propene to ethene produced is 1:21 : 21:2.
Octane is an alkene and the molar ratio of propene to ethene produced is 2:12 : 12:1.
Pentadecane is an unsaturated hydrocarbon and the molar ratio of propene to ethene produced is 2:12 : 12:1.