Question detail
When would you use Tollens' reagent instead of Fehling's reagent?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Aldehydes and ketones (A-level only)
Question
- A. When testing for ketones
- B. When testing for aldehydes in a colorless solution
- C. When testing for alcohols
- D. When testing for carboxylic acids
Answer
When testing for aldehydes in a colorless solution
Explanation
Tollens' reagent is preferred for detecting aldehydes, especially in colorless solutions, as it produces a visible silver mirror. Fehling's reagent is also used for aldehydes but is less effective in colorless solutions, making Tollens' more suitable in such cases.
Common mistake
Confusing Aldehydes and Ketones
Students often confuse aldehydes and ketones, thinking they are the same due to both containing a carbonyl group.
Remember that aldehydes have the carbonyl group at the end of the carbon chain, while ketones have it within the chain.
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