Question detail
What happens to the color of bromine water when it reacts with an alkene?
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. It remains brown
- B. It turns colorless
- C. It turns yellow
- D. It turns green
Answer
The correct option is It turns colorless.
Explanation
The correct option is It turns colorless. It turns colorless is correct because it directly supports the approved learning objective to recall the colour change when bromine water reacts with an alkene. This belongs to Cracking and alkenes 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
Bromine Water Reaction Misunderstanding
Students often think that bromine water turns clear when it reacts with an alkene.
Students should remember that bromine water actually changes from brown to colourless when it reacts with an alkene.
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