1. LO: I understand which alkanols can be oxidised.
6.5 Oxidising Alkanols
6.5.1 Comparing Oxidation
LO: I understand which alkanols can be oxidised.

2. Potassium dichromate is a mild agent.
oxidising
During the oxidation, dichromate solution changes colour from orange to green.
Experiment:
Name
Type
Colour Change
butan-1-ol
primary
orange green
butan-2-ol
secondary
orange green
tertiary
no reaction
2-methylpropan-2-ol
Acidified potassium dichromate solution doesn’t oxidise alkanols.
tertiary
LO: I understand which alkanols can be oxidised.

3. Oxidation Process
LO: I understand how oxidation takes place.

4. Oxidation is gain of or loss of .
oxygen
hydrogen
Primary alkanols are oxidised in two stages:
Stage 1
Loss of hydrogen
ethanol
ethanal
The product of stage 1 is an ( ).
alkanal
aldehyde
LO: I understand how oxidation takes place.

5. ethanoic acid ethanal alkanoic carboxylic
Stage 2
Gain of oxygen
ethanoic acid
ethanal
The product of stage 2 is an acid
( acid).
alkanoic
carboxylic
LO: I understand how oxidation takes place.

6. propan-2-ol propanone alkanone ketone
Secondary Alkanols
Secondary alkanols are oxidised in one stage:
Loss of hydrogen
propan-2-ol
propanone
The product is an ( ).
alkanone
ketone
LO: I understand how oxidation takes place.

7. The products in both cases contain a carbon to oxygen bond:
double C O
This functional group is called a
carbonyl
Tertiary alkanols can’t be oxidised in this way.
LO: I understand how oxidation takes place.

8. Copper(II) Oxide
LO: I understand that oxidation can take place using copper(II) oxide.

9. black brown orange acid
During the reaction the copper(II) oxide ( ) gives up its oxygen forming copper ( ).
black
brown
The pH paper changes from green to showing an has been produced
orange
acid
LO: I understand that oxidation can take place using copper(II) oxide.