Aldehydes and ketones
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Aldehydes and ketones contain the carbonyl group with its polar C=O bond. They of considerable chemical interest as well as being important starting points for chemical synthesis.
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- Could you please give me the name of the yellow precipitate formed when an aldehyde or ketone reacts with Brady's reagent? Is the same precipitate formed with every aldehdyue or ketone? 191108
- My investigation is on determining unknown organic compounds. I have actually determined my first compound which is butanal. I tested this compound with the following compounds and the following results were produced: Brady's reagent - precicpitate formed, therefore aldehyde Tollen's reagent - silver mirror formed, therefore aldehyde Acidified potassium dichromate - orange to green, therefore aldehyde Schiff's Reagent - immediate violet colouration, therefore aldehyde Fehling's Solution - NO COLOUR CHANGE FROM BLUE TO BRICK RED. Boiling point - 75 oC (b.pt of butanal 76 oC) Clearly, I must accept the fact that the compound is the aldehyde butanal. But, when testing butanal with Fehling's solution no result was produced. Could you please explain this anomaly because I do not know whether I should write the Fehling's Solution experiment in my final write-up or if I should just miss it out? 141108
- My investigation is on trying to determine different aldehydes and ketones. i am trying to prove that a unknown compound is specifically butanal and not any other aldehyde. To prove, this would reacting butanal with Brady's reagent and melting the precipitate formed to find the melting point be the correct solution or is there any other way of doing this? If this is the correct method, what is the melting point of the precipitate formed? 021108
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updated: 09 July 2003
