Chemistry Aldehydes & Ketones MDCAT 2015
PMDC Verified Question 81 of 94
Which one of the following is also called silver mirror test?
A
Fehling's solution test
B
Tollen's reagent
C
Iodoform test
D
Benedict's solution tests
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option B: Tollen's reagent
Concept:

Chemical tests for aldehydes often rely on the reduction of a metal complex to produce a distinct visual change.

Solution:

  • Tollen's reagent is an ammoniacal solution of silver nitrate.


  • When an aldehyde is warmed with Tollen's reagent, the aldehyde is oxidized while the \( Ag^+ \) ions are reduced to solid metallic silver (\( Ag \)).


  • This silver coats the inner surface of the glass test tube, functioning as a literal mirror. Hence, it is commonly called the "silver mirror test."


Why other options are incorrect:

Fehling's and Benedict's tests produce a red precipitate of \( Cu_2O \). The Iodoform test produces a yellow precipitate of \( CHI_3 \).

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