Statement 1: Reactivity of ${\mathrm{CH}}_3{\mathrm{CH}}_2{\mathrm{CH}}_2\mathrm{I}>{\mathrm{CH}}_3{\mathrm{CH}}_2{\mathrm{CH}}_2\mathrm{Br}{\text{ in SN}}^2$

Statement 2: I is a better leaving group than -Br

Note: As far as leaving group is considered -I > -Br > -Cl > F for both ${\mathrm{SN}}^1\&{\mathrm{SN}}^2$