Chemistry Aldehydes & Ketones BUMHS 2022
PMDC Verified Question 41 of 94
Which of the following compounds will react with Tollens reagent to give metallic silver?
A
Methanal
B
Acetic Acid
C
Ethyl alcohol
D
Acetone
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option A: Methanal
Concept:

Tollens' reagent is a highly specific mild oxidizing agent that detects the presence of the formyl group (aldehydes).

Solution:

  • Methanal (Formaldehyde, \( HCHO \)) is an aldehyde.


  • Because it contains an oxidizable carbon-hydrogen bond at the carbonyl center, it readily reduces the \( Ag^+ \) ions in Tollens' reagent to metallic silver (the silver mirror).


Why other options are incorrect:

Acetic acid (B) is already fully oxidized at the carbonyl carbon. Ethyl alcohol (C) requires strong oxidizing agents (like dichromate) to oxidize. Acetone (D) is a ketone and resists mild oxidation.

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