Which of the following pairs can be distinguished by Fehling's solution?
Correct answer: A. Glucose and fructose
- A. Glucose and fructose
- B. Glucose and maltose
- C. Propanone and benzaldehyde
- D. Hydroxypropanone and benzaldehyde
Explanation
Option A is correct. Glucose and fructose are both reducing sugars, which can be distinguished by Fehling's solution. This solution is used to identify the presence of reducing sugars by producing a red precipitate upon reaction. Option B is incorrect as maltose is not a reducing sugar. Option C is incorrect because propanone and benzaldehyde are non-reducing sugars. Option D is incorrect as hydroxypropanone is a weaker reducing sugar and benzaldehyde is a non-reducing sugar, making them unsuitable for Fehling's solution reaction.
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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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