Question 1
Question detail
Which of the following is an alkene?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
Question
Type
exam_style
Style
Topic
Reactions of alkenes and alcohols (chemistry only)
Question
Which of the following is an alkene?
Answer
C2H4 is an alkene.
Explanation
This question assesses the student's ability to identify alkenes among different hydrocarbons. C2H4, or ethene, is the only option that fits the alkene structure with a double bond. This response is aligned to Structure and formulae of alkenes because it explains recognise alkenes from their names or from given formulae using the correct AQA GCSE Chemistry organic context. 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 Alkenes
Students often confuse alkenes with alkanes due to similarities in their names and structures.
To differentiate, remember that alkenes contain a carbon-carbon double bond (C=C), while alkanes only have single bonds (C-C).
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