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Flashcards in Aldehydes Deck (3)
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1

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

2

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

Add NaBH4

3

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-)