Question detail
Which functional group can be identified using a simple test with potassium permanganate?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
A-level practical endorsement and required practical activities
Question
- A. Alkene
- B. Alcohol
- C. Aldehyde
- D. Carboxylic acid
Answer
Alkene
Explanation
The correct option is Alkene. Alkene is the best answer because it directly supports the AQA A-Level Chemistry objective to required practical 6: test for alcohol, aldehyde, alkene and carboxylic acid functional groups. This reasoning is anchored to A-level required practical activities in A-level practical endorsement and required practical activities, and it separates required practical from similar A-Level ideas rather than relying on a vague recall statement. Other options are weaker if they use the wrong evidence, calculation, mechanism, observation, unit, or conclusion for this subtopic.
Common mistake
Identifying Functional Groups
Students often confuse the tests for alcohols and aldehydes, leading to incorrect identification of functional groups.
To correctly identify functional groups, remember that alcohols can be tested using acidified potassium dichromate, which turns from orange to green, while aldehydes can be tested with Tollens' reagent, which produces a silver mirror. Always state the specific test used and the expected observation. Keep the correction anchored to A-level required practical activities and the objective: Required practical 6: test for alcohol, aldehyde, alkene and carboxylic acid functional groups.
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