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Question

Tollen's reagent used for the distinction of aldehydes with ketones is

A
aq.CuSO4
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B
[Ag(NH3)2]+
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C
Cu(Citrate)22
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D
None of the above
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Solution

The correct option is B [Ag(NH3)2]+
Tollen's reagent refers to the chemical reagent which is used in the detection of an aldehyde functional group, an aromatic aldehyde functional group, or an alpha hydroxy ketone functional group in a given test substance.
Ketones don't give silver mirror with Tollens' reagent.
Tollen's reagent is ammoniacal solution of silver nitrate
A positive test gives precipitate of elements silver.RCHO+2[Ag(NH3)2]++3OHRCOO + 2Ag + 2H2O+4NH3Aldehyde Tollen's Reagent Carboxylate ion Silver mirror

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