O-LevelChemistryOrganic Chemistry5070/11 · Oct/Nov 2020 · Q41 Mark

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?

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AThe temperature increases up the column.

BX condenses at a lower temperature than Y.

CX has a higher boiling point than Y.

DX has longer chain molecules than Y.

✓ Correct answer

B: X condenses at a lower temperature than Y.

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Topic: Organic Chemistry, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source: O-Level Chemistry, Oct/Nov 2020 Paper 1 Variant 1, question 4.

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