A) are oxidised to acids
B) are reduced to alcohol
C) neither reduced nor oxidised
D) precipitate Ag+ as AgCl
Correct Answer: A
Solution :
When an aldehyde is heated with Tollens reagent, it oxidised to acids and latter is reduced to metallic silver, which deposits on the wall of test tube as bright silver mirror. \[RCHO+\underbrace{2{{[Ag{{(N{{H}_{3}})}_{2}}]}^{+}}+3O{{H}^{-}}}_{Tollens\text{ }reagent}\,\,\,\xrightarrow{Heat}\]\[\underset{\begin{smallmatrix} carboxylate \\ ion \end{smallmatrix}}{\mathop{RCO{{O}^{-}}}}\,\,\,\,+\,\,\,\underset{\begin{smallmatrix} silver \\ mirror \end{smallmatrix}}{\mathop{2Ag\downarrow }}\,\,\,+4N{{H}_{3}}+2{{H}_{2}}O\]
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