Question detail
During fractional distillation, which process primarily determines the separation of hydrocarbons into distinct fractions?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Carbon compounds as fuels and feedstock
Question
- A. The rate of evaporation of each hydrocarbon.
- B. The density of each hydrocarbon.
- C. The boiling point of each hydrocarbon.
- D. The colour of each hydrocarbon.
Answer
The correct option is The boiling point of each hydrocarbon..
Explanation
The correct option is The boiling point of each hydrocarbon.. The boiling point of each hydrocarbon. is correct because it directly supports the approved learning objective to explain that each fraction contains molecules with a similar number of carbon atoms. This belongs to Fractional distillation and petrochemicals within Carbon compounds as fuels and feedstock, so the answer must use the correct organic chemistry context. The other options are incorrect when they confuse the organic family, formula type, reaction condition, product, or property being tested. Keep molecular formula, structural formula, displayed formula, and general formula distinct. Do not confuse alkanes with alkenes, saturated with unsaturated, cracking with combustion, polymers with monomers, or hydrocarbons with oxygen-containing alcohols and carboxylic acids. When formulae are used, preserve the stored notation exactly and explain the GCSE chemistry idea in words rather than using unsupported displayed-formula diagrams.
Common mistake
Misunderstanding Fraction Composition
Students often think that each fraction from fractional distillation contains only one type of hydrocarbon.
Clarify that each fraction actually contains a mixture of hydrocarbons with a similar number of carbon atoms.
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