Discussion
The silver mirror test is given by which of the following compounds?
(1) Acetone (2) Acetaldehyde (3) Benzophenone (4) Formic acid
Answer: D
The silver mirror test is given by acetaldehyde and formic acid - that is, 2 and 4.
Tollens' reagent, ammoniacal silver nitrate, oxidises an aldehyde group and deposits metallic silver on the glass: \[\mathrm{RCHO + 2[Ag(NH_3)_2]^+ + 3OH^- \rightarrow RCOO^- + 2Ag\downarrow + 4NH_3 + 2H_2O}\] Formic acid responds because it contains a \(\mathrm{-CHO}\) group as well as \(\mathrm{-COOH}\). Acetone and benzophenone are ketones and do not react.
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