A) amines
B) alcohols
C) carboxylic acids
D) aldehydes
Correct Answer: D
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. \[RCHO+2{{[Ag{{(N{{H}_{3}})}_{2}}]}^{+}}+3O{{H}^{-}}\xrightarrow{\Delta }\]\[RCO{{O}^{-}}+\underset{\begin{smallmatrix} Silver \\ mirror \end{smallmatrix}}{\mathop{2Ag}}\,\downarrow +4N{{H}_{3}}+2{{H}_{2}}O\]
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