What is Tollen's reagent? Write one usefulness of this reagent.

Explanation

Ammoniacal silver nitrate solution is called Tollens' reagent. It is used to test aldehydes. Both aliphatic and aromatic aldehydes reduce tollen's reagent to shining silver mirror. It is also used to distinguish aldehydes from ketones.
`underset("Tollens' reagent")(2[Ag(NH_(3))_(2)]^(+))+underset("Aldehyde")(RCHO)+3OH^(-) overset("heat")to underset("Silver mirror")(2Agdarr)+underset(Carboxylate ion")(RCOO^(-))+4NH_(3)+2H_(2)O`