(a) Explain in detail the composition of crude oil? (b) What are the main undesirable components in the crude, which need to be removed? What problems do they cause if they remain? (c) What kind of...

Please answer part (a)

Extracted text: (a) Explain in detail the composition of crude oil? (b) What are the main undesirable components in the crude, which need to be removed? What problems do they cause if they remain? (c) What kind of pre-treatment does the crude oil receive, prior to entering the distillation column? What is the benefit of such pre-treatment? (d)Name three examples for each processing unit involved in petroleum refining? (e) What are the various low boiling products of a refinery? (f) Under which kind of industrial chemical process can you classify petroleum refining? Why?