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  4. The aldehyde can be detected by which of the following?

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Q. The aldehyde can be detected by which of the following?

Bihar CECEBihar CECE 2001Aldehydes Ketones and Carboxylic Acids

Solution:

The group to be detected by a reagent must give specific charge in colour or ppt. to show its presence.
Aldehyde + Tollens reagent $ \to $ Silver mirror formed
Aldehyde + Fehlings solution $ \to $ Red ppt. of $ C{{u}_{2}}O $ is formed
Aldehyde + Schiffs reagent $ \to $ Pink colouration
So, all the above reactions are used to detect presence of aldehyde group.