Consider the following reaction:R-CHO + 2[Ag(NH3)2]OH + R-COONH4 + 2Ag + 2NH3 + H2OThis reaction represents:
Correct answer: D. Tollen's test
- A. Fehling test
- B. Benedict test
- C. Ninhydrin test
- D. Tollen's test
Explanation
The reaction you mentioned is actually the Tollens test. It's a chemical test that helps us detect the presence of aldehydes. In this test, an aldehyde (represented by R-CHO) reacts with Tollens' reagent, which is a mixture of silver nitrate (AgNO3) and ammonia (NH3). The reaction produces a silver mirror on the inner surface of the reaction vessel. This silver mirror formation is a positive result for the presence of an aldehyde.
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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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