Question detail
During a laboratory investigation of hydrocarbon combustion, which of the following observations would indicate complete combustion?
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. Only carbon dioxide is produced.
- B. Only water is produced.
- C. Both carbon dioxide and water are produced.
- D. Neither carbon dioxide nor water is produced.
Answer
The correct option is Both carbon dioxide and water are produced..
Explanation
The correct option is Both carbon dioxide and water are produced.. Both carbon dioxide and water are produced. is correct because it directly supports the approved learning objective to investigate the properties of different hydrocarbons. (WS 1.2, 4.1). This belongs to Properties and combustion of hydrocarbons 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 Hydrocarbon Types
Students often assume all hydrocarbons are alkanes and ignore the presence of alkenes and other unsaturated compounds in crude oil.
Remind students that crude oil contains a wide range of hydrocarbons, including alkanes, alkenes, and other unsaturated species; they should distinguish these by their general formulas (CₙH₂ₙ₊₂ for alkanes, CₙH₂ₙ for alkenes) and by recognising unsaturation through tests such as bromine water.
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