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Topic: Fehling's reagent & Tollen's reagent  (Read 20100 times)

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Offline yyyanyy

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Fehling's reagent & Tollen's reagent
« on: October 17, 2006, 10:57:58 AM »
what is Fehling's reagent & Tollen's reagent ?

and then what is the results of methanal , ethanal , benzaldehyde , propanone on reacting with  Fehling's reagent & Tollen's reagent ?

Thank you so much ! =]
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Offline enahs

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Re: Fehling's reagent & Tollen's reagent
« Reply #1 on: October 17, 2006, 11:03:45 AM »
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Offline Donaldson Tan

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Re: Fehling's reagent & Tollen's reagent
« Reply #2 on: October 17, 2006, 05:43:44 PM »
one can oxidise aldehyde and ketone.

the other can only oxidise aldehyde.

they can be used to differentiate aldehyde from ketone and vice versa
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Offline FeLiXe

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Re: Fehling's reagent & Tollen's reagent
« Reply #3 on: October 19, 2006, 08:02:22 AM »
http://www.chemicalforums.com/index.php?topic=8846.0

they don't oxidise ketones. you'd have to split up the carbon chain

the differentiation is between aromatic aldehyde and aliphatic aldehyde

fehling can only do aliphatic, tollens both

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