04. 2,4 - DNP
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Last updated 10:12 AM on 11/21/25
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6 Terms
1
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What is 2,4-DNP the test for?
Aldehydes and ketones
2
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What is the positive reaction of aldehydes and ketones with 2,4-DNP?
Orange coloured ppt
3
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What are the orange coloured precipitates called?
2,4-Dinitrophenylhydrazones
4
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What can be done with the orange precipitates?
Purified to give products that have precise melting points -> can be used to identify if it is an aldehyde or ketone
5
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What kind of reaction is the one with 2,4-DNP?
Nucleophilic addition - elimination reaction
6
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How is a derivative purified?
Filter, wash with water, dissolve in min amount of solvent, evaporate, recrystallise, dry in oven (below melting point)
Note 
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