Question detail
Which of the following best explains the composition of crude oil?
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. It contains only alkanes.
- B. It contains only alkenes.
- C. It contains a very large number of different hydrocarbons and other compounds.
- D. It contains only water and salt.
Answer
The correct option is It contains a very large number of different hydrocarbons and other compounds..
Explanation
The correct option is It contains a very large number of different hydrocarbons and other compounds.. It contains a very large number of different hydrocarbons and other compounds. is correct because it directly supports the approved learning objective to describe crude oil as a mixture of a very large number of compounds. This belongs to Crude oil, hydrocarbons and alkanes 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
Misidentifying crude oil as a single compound
Students often think crude oil is a single, pure substance rather than a complex mixture of many hydrocarbons and other compounds.
Explain that crude oil is a heterogeneous mixture containing thousands of different molecules, mainly hydrocarbons, and that this diversity is why fractional distillation is needed to separate useful fractions.
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