MDCAT
Chemistry
2023
Chemistry · Aldehydes and Ketones
Work through this past-paper style MCQ, then read the full explanation. Practice more chemistry questions on mMCQ with adaptive practice and topic analytics.
Question
The appearance of a silver mirror in Toliens test indicates the presence of which of the following?
Options
- A
A ketone
- B
An aldehyde
- C
An acid
- D
An alcohol
Explanation
Aldehyde (Correct)
- Explanation: Aldehydes reduce Tollens' reagent (Ag⁺) to metallic silver, creating a silver mirror on the test tube.
Ketone (Incorrect)
- Explanation: Ketones do not reduce Tollens' reagent, so they do not produce a silver mirror in the test.
Aldehyde (Correct)
- Explanation: Aldehydes reduce Tollens' reagent (Ag⁺) to metallic silver, creating a silver mirror on the test tube.
Acid (Incorrect)
- Explanation: Carboxylic acids do not react with Tollens' reagent to produce a silver mirror.
Alcohol (Incorrect)
- Explanation: Alcohols do not reduce Tollens' reagent, and thus do not produce a silver mirror either.
Tagged under Chemistry · Aldehydes and Ketones · 2023