2020 Chemistry Paper 2

Question 1

State limitations of using radical substitution in organic synthesis.

Answer 1

• further substitutions OR produces different termination products OR mixture of products formed
• substitution at different positions along chain

Question 2

Define heterolytic fission

Answer 2

• One bonded atom receives both electrons.
• Breaking of a covalent bond

Question 3

What steps are taken in the purification of an organic liquid?

Answer 3

1. Neutralise, e.g. Na₂CO₃
2. Separate
3. Dry, e.g. MgSO₄
4. Redistill