Question detail
Why are hydrocarbons the dominant component 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. They are produced by ancient plankton
- B. They are formed by volcanic activity
- C. They are added during refining
- D. They are the result of atmospheric deposition
Answer
The correct option is They are produced by ancient plankton.
Explanation
The correct option is They are produced by ancient plankton. They are produced by ancient plankton is correct because it directly supports the approved learning objective to state that most of the compounds in crude oil are hydrocarbons. 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
Misunderstanding Hydrocarbon Composition
Students often state that all compounds in crude oil are hydrocarbons, failing to recognize that crude oil is a mixture of many different compounds.
Emphasize that while most compounds in crude oil are hydrocarbons, there are also other types of compounds present in the mixture.
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