Which one of the following test is given by both aldehyde and ketone?
Correct answer: C. 2, 4 DNPH test
- A. Silver mirror test
- B. Fehling's solution test
- C. 2, 4 DNPH test
- D. Benedict's solution test
Explanation
Both aldehydes and ketones give a positive result in the 2,4-DNP test. This test involves adding a solution of 2,4-dinitrophenylhydrazine (2,4-DNP) to the aldehyde or ketone compound. If the compound contains a carbonyl group, it will react with the 2,4-DNP reagent to form a yellow or orange precipitate. This color change indicates the presence of an aldehyde or ketone. The 2,4-DNP test is a common and useful way to identify these functional groups in organic compounds.
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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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