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Q.Why is benzaldehyde NOT oxidized by Fehling solution ?
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Start your 14-day free trial to unlock the full solution →Fehling solution's oxidant, the Cu²⊕-tartrate complex, is even milder than Tollens' reagent. In benzaldehyde the aromatic ring's resonance feeds electron density into the carbonyl, lowering the reactivity of the aldehydic C-H — enough that aromatic aldehydes fail to reduce Fehling solution (no red Cu₂O), though aliphatic aldehydes do. This contrast is itself used to di …
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