O-LevelChemistryOrganic Chemistry5070/12 · May/June 2014 · Q51 Mark

Crude oil is fractionally distilled in a fractionating column. The positions at which fractions X and Y are collected 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, May/June 2014 Paper 1 Variant 2, question 5.

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