During oxidation of unsymmetrical ketones the point of cleavage is such that keto group stays preferentially with the smaller alkyl group popoff ‟ s rule).
[ Fehling solution is a mixture of Fehling solution A and Fehling solution B in 1: 1 ratio. Fehling solution A is aqueous copper sulphate and Fehling solution B is alkaline sodium potassium tartrate which is also called, Rochelle salt.]
( c) Benedict solution With it, aldehydes( except benzaldehyde) also give red ppt. of CU2O.
( d) Schiff’ s reagent It is an aqueous solution of magenta or pink coloured rosaniline hydrochloride which has been decolourised by passing
SO2, Aldehydes give pink colour with this reagent but ketones do not.
Haloform reaction Aldehydes and ketones having at east one methyl group [ 3-α hydrogen ] linked to the carbonyl carbon atom( methyl ketones) are oxidised by sodium hypohalite to sodium salts of corresponding carboxylic acids having one carbon atom less than that of carbonyl compound. The methyl group is converted to haloform.