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What is Fehligns solution? How it reacts...

What is Fehligns solution? How it reacts with aldehydes?

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Fehlings solution is a alkaline solution of copper sulphate solution containing sodium potassium tartarate. On heating an aldehyde with Fehlings solution a reddish brown precipitate is obtained. Fehling solution oxidses aldehyde to carboxylate anion.
`R-CHO+2Cu^(2+)+5OH^(-)toRCOO+Cu_(2)O+3H_(2)O`
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