Chemistry Aldehydes & Ketones UHS 2022
PMDC Verified Question 30 of 94
Which of the following is also called silver mirror test?
A
Benedict's solution test
B
Iodoform test
C
Fehling's solution test
D
Tollen's test
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option D: Tollen's test
Concept:

Aldehydes are easily oxidized, and this property is exploited in chemical identification tests using mild oxidizing agents.

Solution:

  • Tollen's reagent consists of an ammoniacal silver nitrate solution containing the diamminesilver(I) complex, \( [Ag(NH_3)_2]^+ \).


  • When heated with an aldehyde, the \( Ag^+ \) ions are reduced to solid elemental silver (\( Ag \)).


  • This silver deposits on the inner glass surface of the test tube, creating a highly reflective surface, hence the name Silver Mirror Test.


Why other options are incorrect:

Benedict's and Fehling's tests produce a brick-red precipitate of Copper(I) oxide. The Iodoform test produces a yellow precipitate of triiodomethane.

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