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  4. Silver mirror test is given by

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Q. Silver mirror test is given by

AMUAMU 2015

Solution:

Tollens reagent is a chemical reagent used to determine the presence of an aldehyde or $\alpha$-hydroxy ketone functional groups. A positive test with. Tollens, reagent is indicated by the precipitation of elemental silver, often producing a characteristic silver mirror on the-inner surface of the reaction vessel.
$R CHO +2\left[ Ag \left( NH _{3}\right)_{2}\right]^{+}+3 OH ^{-} \xrightarrow{\Delta}$
$R C O O^{-}+\underset{\text{Silver mirror}}{2 A g} \downarrow+4 N H_{3}+2 H_{2} O$