Which of the following gives positive haloform test and positive Fehling solution test
Correct answer: B. Acetaldehyde
- A. Acetone
- B. Acetaldehyde
- C. Ethanol
- D. Formaldehyde
Explanation
Acetaldehyde gives a positive haloform test and a positive Fehling solution test. The haloform test is used to detect the presence of a methyl ketone or a methyl group attached to a carbonyl group, and acetaldehyde has a methyl group that reacts with the haloform reagent. The Fehling solution test is used to detect the presence of an aldehyde, and acetaldehyde is an aldehyde. So, acetaldehyde gives positive results for both tests.
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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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