Which of the following is a free radical substitution reaction?

1. Benzene with ${\mathrm{Br}}_2/{\mathrm{AlCl}}_3$
2. Acetylene with $\mathrm{HBr}$
3. Methane with ${\mathrm{Br}}_2/\mathrm{hv}$
4. Propene with $\mathrm{HBr}/{\left({\mathrm{C}}_6{\mathrm{H}}_5\mathrm{COO}\right)}_2$

Asked in: NEET 2020 (Phase 2)

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