Functional Group Tests

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Aldehyde (-CHO)

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Test Name

Tollens' Test (Silver Mirror Test)

Reagent Used

Ammoniacal Silver Nitrate solution [Ag(NH₃)₂]⁺

Observation

A bright silver mirror forms on the inner walls of the test tube.

Chemical Equation

R-CHO + 2[Ag(NH₃)₂]⁺ + 3OH^- → R-COO^- + 2Ag↓ + 4NH₃ + 2H₂O

Select Functional Group to Test

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