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Topic: distinguishing compounds  (Read 5780 times)

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Offline cuongt

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distinguishing compounds
« on: July 12, 2006, 03:50:13 AM »
cinnamaldehyde and cinnamol can be distinguished by odour and chemical means describe a chemical test to distinguish between them.
wat i dont understand is what test can be used to determine them

Offline Mitch

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Re: distinguishing compounds
« Reply #1 on: July 12, 2006, 05:00:27 AM »
Can you post the chemical structures?
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Offline Will

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Re: distinguishing compounds
« Reply #2 on: July 12, 2006, 07:51:59 AM »
cuongt, are you aware of the test with 2,4-dinitrophenylhydrazine?

Offline Dan

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Re: distinguishing compounds
« Reply #3 on: July 12, 2006, 08:48:09 AM »
Wikipedia is your friend:


"Another oxidation reaction is the silver mirror test. In this test, an aldehyde is treated with Tollens' reagent, which is prepared by adding a drop of sodium hydroxide solution into silver nitrate solution to give a precipitate of silver(I) oxide, and then adding just enough dilute ammonia solution to redissolve the precipitate in aqueous ammonia to produce [Ag(NH3)2]+ complex. This reagent will convert aldehydes to carboxylic acids without attacking carbon-carbon double-bonds. The name silver mirror test arises because this reaction will produce a precipitate of silver whose presence can be used to test for the presence of an aldehyde."
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Offline cuongt

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Re: distinguishing compounds
« Reply #4 on: July 12, 2006, 07:32:39 PM »
thanks will for da pic and no im not aware of that test will and thanx dan   :D. is there sum way to test the alcohol instead of testing the aldehyde jst wondering

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