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 $[Ag(NH_3)_2]^+$

Observation

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

Chemical Equation

$$R-CHO + 2[Ag(NH_3)_2]^+ + 3OH^- \xrightarrow{\Delta} R-COO^- + 2Ag\downarrow + 4NH_3 + 2H_2O$$

Select Functional Group to Test

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