Because of the hydrogen atom of the carbonyl group
27 of 39
How else can aldehydes be distinguished from ketones?
React them with Fehling's solution. Aldehyde is oxidised and the blue Cu 2+ are reducded to Cu +, forming an orange/brown precpitate. Ketones are not oxidised so no colour change
28 of 39
What is Fehling's solution?
Cu 2+ ions and alkali
29 of 39
How can you reduce carbonyl compounds back to alcohol?
using the powerful reducing agent sodium tetrahydridoborate (NaBH4). (This reaction is on the exam data sheet)
30 of 39
What type of reaction do ketones and aldehydes undergo with hydrogen cyanide and in the presence of what?
Nucleophilic addition. Alkali.
31 of 39
What is the product of that reaction?
A cyanohydrin or 2-hydroxynitrile
32 of 39
What is the Bronstead-Lowry theory?
A base is a H+ acceptor and an acid is a H+ donor.
33 of 39
What word describes a substance that can act as both an acid and a base?
amphoteric
34 of 39
What is the molecular ion in mass spec?
The molecule being tested when it's lost just one electron
35 of 39
What is fragmentation in mass spec?
When the molecular ion breaks up into other smaller fragment ions and uncharged fragments
36 of 39
What does the x-axis of a mass spectrum show?
mass-to-charge ratio (m/z)
37 of 39
What does the y-axis show?
Intensity
38 of 39
Every line in the sprectrum represents a positively charged ion. True of false?
Comments
No comments have yet been made