The table shows the boiling point range of four fractions obtained from crude oil. Which fraction is collected nearest the top of the fractionating column?
Table: The boiling point range of four fractions obtained from crude oil
| Fraction | Boiling point range in ∘C^\circ\text{C}∘C |
|---|---|
| W | 40 to 75 |
| X | 120 to 180 |
| Y | 250 to 350 |
| Z | above 350 |
Z
Y
X
W