Exam QNS +ANS 2

Question 1

Explain why the reaction is described as a free-radical substitution reaction.

Answer 1

• in the initiation step, Br2 undergoes homolytic fission to form 2 bromine radicals with 1 unpaired electron each
• the bromine radicals then goes to replace a hydrogen atom in propane to from bromopropane during the propagation steps