JEE Main Chemistry question

Which of the following can be used to differentiate between aldehyde and ketone?

(A)Ammoniacal AgNO₃
(B)Ammoniacal AgNO₃ in presence of tartrate ion
(C)I₂ in the presence of base
(D)Ammoniacal AgNO₃ in the presence of citrate ionCorrect

Answer: (D)

Solution

Tollens' reagent (ammoniacal silver nitrate) distinguishes aldehydes (positive silver-mirror test) from ketones (no reaction), and the Benedict's-type variant using citrate (rather than tartrate, which is specific to Fehling's) is the form specified here as the standard

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Question ID VK-149162