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What is Tollen's reagent?


Tollen's reagent is a mixture of liquid ammonia and silver nitrate , It was named after its discoverer, the German chemist Berhard Tollens. 

Basically positive test means Tollens' reagent oxidize, aldehyde aromatic aldehyde and alpha-hydroxy ketone functional groups into corresponding acid and  the precipitation of elemental silver, often producing a characteristic "silver mirror" on the inner surface of the reaction vessel.

                                        AgNO3 + NH4OH --> NH4NO3 +AgOH
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