Question detail
What is the result of adding Fehling's reagent to a ketone?
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. A red precipitate forms
- B. A blue solution remains unchanged
- C. A gas is produced
- D. A colorless solution forms
Answer
A blue solution remains unchanged
Explanation
Ketones do not react with Fehling's reagent, so the blue solution of copper(II) ions remains unchanged. This lack of reaction is a key characteristic that distinguishes ketones from aldehydes, which do react and produce a red precipitate.
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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