Functional Group Testing Flashcards
1
Q
Alkene
A
Reagent: Br2(aq)
Observation: orange to colourless
2
Q
Primary alcohol, secondary alcohol, aldehyde
A
Reagent: acidified potassium dichromate
Observation: orange to green
3
Q
Aldehyde
A
Reagent: Tollen’s
Observation: silver mirror
4
Q
Aldehyde and ketone
A
Reagent: 2,4-DNP
Observation: orange precipitate
5
Q
Carboxylic acid
A
Reagent: sodium chloride
Observation: fizzing
6
Q
Haloalkane (group 7)
A
Reagents: ethanol and silver nitrate
Observation: white (Cl) cream (Br) or yellow (I) precipitate
7
Q
Phenol
A
Reagents: test ph with indicator paper- if an acid, add sodium carbonate
Observations: UI goes orange but NO fizzing takes place
8
Q
A
-add 2,4-DNP, orange precipitate forms
-take melting point of solid
-compare with know values
9
Q
what is a carbonyl?
A
aldehyde or Ketone
