Question detail
What type of reaction do alkenes undergo with hydrogen?
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. Combustion
- B. Addition
- C. Substitution
- D. Decomposition
Answer
The correct option is Addition.
Explanation
The correct option is Addition. Addition is correct because it directly supports the approved learning objective to recognise addition polymers and monomers from diagrams and from the presence of the C=C functional group in the monomers. 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
Identifying Addition Polymers
Students often confuse addition polymers with condensation polymers, failing to recognize that addition polymers are formed from monomers with C=C functional groups.
Focus on the structure of the monomers; remember that addition polymers are made from monomers that contain a carbon-carbon double bond (C=C) and do not lose any small molecules during polymerization.
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