Multiple Choice
Which of the following is an example of negative control using an inducible system in organic chemistry reactions?
3. Acids and Bases
Organic Chemistry Reactions
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Which of the following reagents is commonly used to differentiate between aldehydes and ketones in organic chemistry reactions?
A
Fehling's solution
B
Benedict's solution
C
Tollens' reagent
D
Lucas reagent
Verified step by step guidance1
Understand the structural difference between aldehydes and ketones: Aldehydes have a carbonyl group (C=O) at the end of the carbon chain, while ketones have the carbonyl group within the carbon chain.
Recognize that Tollens' reagent is specifically used to test for the presence of aldehydes. It consists of a solution of silver nitrate (AgNO₃) in ammonia (NH₃).
Recall that when Tollens' reagent is added to an aldehyde, it gets oxidized to a carboxylic acid, and the silver ions (Ag⁺) are reduced to metallic silver (Ag), forming a silver mirror on the test tube.
Note that ketones do not react with Tollens' reagent because they cannot be easily oxidized, thus no silver mirror is formed.
Conclude that the formation of a silver mirror indicates the presence of an aldehyde, while no reaction suggests a ketone, making Tollens' reagent a useful tool for differentiation.
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