Benedict's test is used to detect the presence of:
Correct answer: C. Reducing sugars (which contain an aldehyde or α-hydroxy ketone group)
- A. Aromatic aldehydes
- B. Ketones
- C. Reducing sugars (which contain an aldehyde or α-hydroxy ketone group)
- D. Non-reducing sugars
Explanation
Benedict's test is a chemical test used to detect reducing sugars. These sugars typically have a free aldehyde group or an α-hydroxy ketone group, which can be oxidized by the Cu²⁺ ions in the Benedict's reagent, resulting in a red precipitate of Cu₂O.
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About Aldehydes and Ketones
Aldehydes and ketones contain the polar carbonyl group, but aldehydes are generally more readily oxidised and more reactive than ketones. Coverage includes preparation by oxidation or reduction routes, nucleophilic addition of reagents such as hydrogen cyanide and bisulfite, and tests that distinguish aldehydes from ketones.
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