L21 - Oxidation (and Reduction)

Question 1

What is oxdiation?

Answer 1

• loss of e-
• gain of O
• loss of H

Question 2

What is reduction?

Answer 2

• gain of e-
• loss of O
• gain of H

Question 3

What is the order of increasing oxidation?

Answer 3

• methyl
• alcohol
• ketone
• COOH
• CO2

Question 4

How are alcohols oxidised in the body?

Answer 4

By alcohol dehydrogenase
- into aldehyde

Question 5

How are aldehydes oxidised in the body?

Answer 5

By acetaldehyde dehydrogenase
- into caboxylic acid

Question 6

How are primary alcohols oxidised in the lab?

Answer 6

Using pyridinium chlorochromate (PCC, mild oxidant) and CH2Cl2
- into aldehyde

Question 7

What happens to primary alcohold if oxidised with a strong oxidant, eg?

Answer 7

Oxidised into COOH
- KMnO4 acid

Question 8

How do you oxidise an aldehyde into a COOH?

Answer 8

Using strong oxidant

Question 9

How do you oxidise a secondary alcohol in the lab?

Answer 9

Using mild or strong [O]
- into ketone

No further oxidation

Question 10

How do you convert an alkene into a dihydroxycation?

Answer 10

OsO4 H2O2

Question 11

How do you convert an alkene into an epoxide?

Answer 11

mCPBA

Question 12

What reaction can alkenes go through?

Answer 12

Ozonolysis

Question 13

Why do we not use 100% O2?

Answer 13

Becaise O2 can turn into readicals