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What is Tollen's reagent? How it reacts ...

What is Tollen's reagent? How it reacts with aldehydes?

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Tollen.s reagent is an ammonical solution of silver nitrate. On warming an aldehyde with freshly prepared Tollen.s reagent a bright silver mirror is produced due to the formation of silver metal.
`RCHO+2[Ag(NH_(3))_(2)]^(+)+3OH^(-)toRCOO^(-)+2Ag+2H_(2)O+4NH_(3)`
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