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Flashcards in Aldehydes Deck (3)
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What are the tests for aldehydes only

Fehling's solution --> contains Cu2+ ions in alkaline soliution Blue solution to brick red ppt (Cu2+ is reduced to Cu2O) Tollen's reagent --> aldehyde is oxidised to carbox acid reducing the Ag+ ions to Ag atoms Silver mirror forms


How do you get an aldehyde or ketone back to the original alcohol it was oxidised from

Add NaBH4


What is the mechanism of nucleophilic addition with an aldehyde

H reacts with oxygen

Cyanide reacts with carbon

To generate CN- ion nucleophile --> use HCN in alkali & acidifed KCN (provides the H+ and CN-)