Using relevant equations, show the initiation and the propagation steps for this reaction.

Bromine was added to hexane, hex-1-ene and benzene. Identify the compound(s) which will react with bromine in a well-lit laboratory.

Polyvinyl chloride (PVC) is a polymer with the following structure.

State the structural formula for the monomer of PVC.

Initiation:

Cl–Cl → Cl• + Cl•

Propagation:

Cl• + CH₄ → Cl–H + •CH₃

Cl–Cl + •CH₃ → Cl–CH₃ + Cl•

Do not penalize missing electron dot on radicals if consistent throughout.

Accept Cl₂, HCl and CH₃Cl without showing bonds.

Do not accept hydrogen radical, H• or H, but apply ECF to other propagation steps.

[3 marks]

hexane AND hex-1-ene

Accept “benzene AND hexane AND hex-1-ene”.

[1 mark]

OR

Accept “CH₂CHCl” or “CHClCH₂”.

Do not accept “C₂H₃Cl”.

[1 mark]