Question detail
Which of the following is a characteristic of alkenes?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Reactions of alkenes and alcohols (chemistry only)
Question
- A. They contain a single carbon-carbon bond.
- B. They are saturated hydrocarbons.
- C. They contain a double carbon-carbon bond.
- D. They do not react with halogens.
Answer
The correct option is They contain a double carbon-carbon bond..
Explanation
The correct option is They contain a double carbon-carbon bond.. They contain a double carbon-carbon bond. is correct because it directly supports the approved learning objective to alkenes can be used to make polymers such as poly(ethene) and poly(propene) by addition polymerisation. This belongs to Polymerisation and naturally occurring polymers within Reactions of alkenes and alcohols (chemistry only), 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
Confusing Alkenes and Alcohols
Students often confuse alkenes with alcohols, thinking both can be used to make polymers.
Remember that alkenes are hydrocarbons with a double bond and are used in addition polymerisation, while alcohols contain the –OH functional group and do not form addition polymers.
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