The active ion in Tollen's reagent is

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(D) The Tollen's reagent is an ammoniacal silver nitrate solution. The active species in Tollen's reagent is the diamminesilver$(I)$ complex ion,repre

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$Ag(NH_3)_2^+$

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(D) The Tollen's reagent is an ammoniacal silver nitrate solution. The active species in Tollen's reagent is the diamminesilver$(I)$ complex ion,represented as $[Ag(NH_3)_2]^+$. During the reaction with aldehydes,the $Ag^+$ ion in the complex is reduced to metallic silver $(Ag)$,which deposits on the inner walls of the test tube to form a silver mirror. Therefore,the correct option is $(D)$.

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