In Tollen’s test for aldehyde, the overall number of electron(s) transferred to the Tollen’s reagent formula $[A g (N H_{3})_{2}]^{+}$ per aldehyde group to form silver mirror is______. (Round off to the Nearest Integer)

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Solution

Answer: 2

Reaction of tollen's reagant with aldehyde form a silver mirror.
In this reaction, the aldehyde group is oxidised to acid and the reduced silver metal get deposited on the wall to form mirror.

$R - C H O 2 [A g (N H_{3})_{2}]^{+} O H^{-} - ----------- \to R C O O H + 2 A g + 2 N H_{3} + H_{2} O$

$2 A g^{+} 2 e^{-} - - \to 2 A g$
Thus, two electrons are transferred from an aldehyde group.

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