Chemical Forums

Chemistry Forums for Students => Organic Chemistry Forum => Topic started by: yyyanyy on October 17, 2006, 10:57:58 AM

Title: Fehling's reagent & Tollen's reagent
Post by: yyyanyy 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 ! =]

Title: Re: Fehling's reagent & Tollen's reagent
Post by: enahs on October 17, 2006, 11:03:45 AM

http://en.wikipedia.org/wiki/Fehling%27s_solution
http://en.wikipedia.org/wiki/Tollen%27s_reagent

Title: Re: Fehling's reagent & Tollen's reagent
Post by: Donaldson Tan 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

Title: Re: Fehling's reagent & Tollen's reagent
Post by: FeLiXe 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