Chemistry · Oct / Nov 2020 · Paper 11 · Question 4

Petroleum (crude oil) is separated into useful fractions by fractional distillation. The positions at which fractions X and Y are collected from the fractionating column are shown. Which statement is correct?

1. AThe temperature increases up the column.
2. BX condenses at a lower temperature than Y.
3. CX has a higher boiling point than Y.
4. DX has longer chain molecules than Y.

As printed in the paper