5.12 I can recall the problems associated with the fractional distillation of crude oil

Read Chem4you P.145

a. When crude oil undergoes( fractional distillation )there are too many( long )chain hydrocarbons (e.g. bitumen) and produced not enough( short ) chain hydrocarbons (e.g.diesel)

b. To solve these problems,( long chain hydrocarbons) undergo a chemical reaction called (crackling)