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why benzaldehyde do not respond to fehling's test?
Benzaldehyde is a mixture of equal volumes of 2 solutions namely, Fehling solution A and Fehling solution B.
Fehling solution A consists of CuSO4 solution
Fehling solution B consists of NaOH+Roschelle's salt..
Benzaldehyde easily reacts with this NaOH in rochelle's salt instead of reacting with CuSO4 .. Hence Benzaldehyde doesnt react with fehling solution..
Extra: Rochelle's salt is sodium potassium tartate..
structure: COONa
|
H--- C --OH
OH--- C -- H
COOK
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