This comes from a VCE Chemistry examination question (Question 11, Multiple-choice, 2009).
Which one of the following statements about propene is not correct?
A. It undergoes an addition reaction with hydrogen to form propane.
B. It undergoes a polymerisation reaction expelling water in the process.
C. Weak dispersion forces act between propene molecules and consequently it is a gas at room
D. One propene molecule will react with excess oxygen to produce three molecules of water and three molecules of carbon dioxide.
The correct multiple choice answer is option (D). Why?
I tried balancing the equation as follows
C3H6 + (9/2)O2 ----> 3CO2 + 3H2O
Is having 9/2 possible? Could someone explain why D is the answer please?