OCR Chemistry A – 4.1.2(f) Free Radical Substitution (training)

Tick any steps below that are PROPAGATION steps...

• CH₃CH₃ + Br₂ → CH₃CH₂Br + HBr

• CH₃CH₃ + Br• → CH₃CH₂• + HBr

• CH₃CH₂• + CH₃CH₂• → CH₃CH₂CH₂CH₃

• CH₃CH₂• + Br• → CH₃CH₂Br

Tick any steps below that are INITIATION steps...

• CH₃CH₂• + Br• → CH₃CH₂Br

• Br• + Br• → Br₂

• CH₃CH₂• + Br₂ → CH₃CH₂Br + Br•

• Br₂ → 2Br•

Tick any steps below that are TERMINATION steps...

• CH₃CH₃ + Br₂ → CH₃CH₂Br + HBr

• CH₃CH₃ + Br• → CH₃CH₂• + HBr

• CH₃CH₂• + CH₃CH₂• → CH₃CH₂CH₂CH₃

• CH₃CH₂• + Br• → CH₃CH₂Br

Tick any steps below that are PROPAGATION STEP 2 ...

• CH₃CH₃ + Br₂ → CH₃CH₂Br + HBr

• CH₃CH₃ + Br• → CH₃CH₂• + HBr

• Br₂ + CH₃CH₂• → CH₃CH₂Br + Br•

• CH₃CH₂• + Br• → CH₃CH₂Br

Which ONE of the below CANNOT be called

PROPAGATION STEP 1 ...

• butane + Cl• → butanyl radical + hydrochloric acid

• [CH₃CH₂]• + Br₂ → CH₃CH₂Br + Br•

• CH₃CH₃ + Br• → [CH₃CH₂]• + HBr

• CH₃CH₂CH₃ + F• → [CH₃CHCH₃]• + HF

Tick any steps below that are an INITIATION step for this reaction...

• Cl• + Cl• → 2Cl₂

• CHCl₃ → CHCl₂• + H•

• Cl₂ → 2Cl•

• CCl₃• + Cl• → C₂Cl₆

Tick any steps below that are a TERMINATION step for this reaction...

• •CH₃ + •CH₃ → CH₃CH₃

• CCl₃• + Cl₂ → CCl₄ + Cl•

• CCl₃• + Cl• → CCl₄

• CCl₃• + CCl₃• → C₂Cl₆

Tick any steps below that are a

FIRST PROPAGATION STEP for this reaction...

• Cl• + •CHCl₂ → CHCl₃

• Cl• + •CCl₃ → CHCl₄

• CCl₃• + Cl₂ → CCl₄ + Cl•

• CHCl₃ + Cl• → •CCl₃ + HCl

Which is the balanced overall equation for this reaction?

• CH₃CH₂CH₃ + 2F₂ → CH₂FCHFCH₃ + 2HF

• ^•CH₂CHFCH₃ + F^• → CH₂FCHFCH₃

• CH₃CHFCH₃ + 2F₂ → CH₂FCHFCH₃ + 2HF

• CH₃CHFCH₃ + F₂ → CH₂FCHFCH₃ + HF

Which is an UNDESIRED TERMINATION step, for this reaction?

• ^•CH₂CHFCH₃ + ^•CH₂CHFCH₃ → CH₃CHFCH₂CH₂CHFCH₃

• ^•CH₂CHFCH₃ + F^• → CH₂FCHFCH₃

• F• + F• → F₂

• CH₃CHFCH₃ + F• → ^•CH₂CHFCH₃ + HF