Question detail
What is the expected observation when an alkene reacts with bromine water?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Organic analysis
Question
- A. No change in color
- B. Color change from brown to colorless
- C. Formation of a precipitate
- D. Effervescence observed
Answer
Color change from brown to colorless
Explanation
Alkenes react with bromine water, resulting in a decolorization of the brown bromine solution to colorless, indicating the presence of a double bond characteristic of alkenes.
Common mistake
Identifying Functional Groups
Students often confuse the test-tube reactions for alcohols and aldehydes, leading to incorrect identification.
To correctly identify functional groups, remember that alcohols react with acidified potassium dichromate to produce a color change from orange to green, while aldehydes also react but may produce a different observable change when tested with Tollens' reagent, forming a silver mirror.
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