(a(i))[1]
Give one additional reason why petroleum companies carry out cracking.
(a(ii))[1]
Complete the equation for the cracking of tridecane, $\text{C}_{13}\text{H}_{28}$, to make propene, $\text{C}_3\text{H}_6$, and one further hydrocarbon. $\text{C}_{13}\text{H}_{28} \rightarrow \text{C}_3\text{H}_6 + \ldots$
(b(i))[1]
State the general formula of an alkene.
(b(ii))[1]
Propene reacts with steam in an addition reaction. Predict the molecular formula of the product formed in this reaction.
(b(iii))[2]
When propene burns incompletely, a small amount of carbon dioxide is also produced. Name two other substances formed when propene undergoes incomplete combustion.
(c)[2]
The structure of propene is shown. Work out the partial structure of poly(propene) to represent three repeat units.