11. O/N 2013/P11/Q37
The diagram shows the fractionation of crude oil.
Which row explains why fraction R is collected above fraction S?
Answer: D
Explaination
Here fraction R is distilled at top of the fractionating column because fraction R has lower boiling point and having lower weight (smaller HC chain) whereas, fraction S is distilled at bottom of the fractionating column because fraction S has higher boiling point and having higher weight (bigger HC chain).
