Aldehydes Flashcards
(3 cards)
1
Q
What are the tests for aldehydes only
A
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
Q
How do you get an aldehyde or ketone back to the original alcohol it was oxidised from
A
Add NaBH4
3
Q
What is the mechanism of nucleophilic addition with an aldehyde
A
H reacts with oxygen
Cyanide reacts with carbon
To generate CN- ion nucleophile –> use HCN in alkali & acidifed KCN (provides the H+ and CN-)
