O-LevelChemistryOrganic Chemistry5070/12 · Oct/Nov 2023 · Q341 Mark

In the fractional distillation of petroleum, different fractions are obtained at the top and bottom of the fractionating column. Which properties does the fraction obtained at the top of the fractionating column have, compared with the fraction obtained at the bottom? 1 higher viscosity 2 lower boiling point 3 lower volatility 4 shorter chain length

A1 and 2

B1 and 3

C2 and 4

D3 and 4

✓ Correct answer

C: 2 and 4

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Topic: Organic Chemistry, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source: O-Level Chemistry, Oct/Nov 2023 Paper 1 Variant 2, question 34.

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