JEE Main · 2011 · 10 Apr 2011 · Offline · Aldehydes Ketones and Carboxylic Acids

Silver Mirror test is given by which one of the following compounds?

(A)Acetone
(B)Formaldehyde✓ Correct
(C)Benzophenone
(D)Acetophenone

Answer: (B)

Solution

The silver-mirror (Tollens') test is positive for aldehydes: the aldehyde is oxidised to the carboxylate while

A g^{+}

in the ammoniacal reagent is reduced to metallic silver, which deposits as a bright mirror. Formaldehyde

HCHO

is an aldehyde and gives a strong positive test. Acetone and acetophenone are ketones and benzophenone is a diaryl ketone; ketones are not oxidised by Tollens' reagent and give no silver mirror.

JEE Main · 2011 · 10 Apr 2011 · Offline · Single correct option

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