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  4. Which does not react with Fehling solution?

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Q. Which does not react with Fehling solution?

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Solution:

Aldehydes are oxidised by Fehling solution, while ketones do not react with Fehling solution
$RCHO+\underset{\text{[from Fehling solution]}}{2Cu^{2+}}+3OH^{-} \to RCOO^{-}+\underset{\text{Red}}{{2Cu}} \downarrow +2H_{2}O$