What is the order of reactivity of CH₃CH₂F , CH₃CH₂Cl , CH₃CH₂Br , and CH₃CH₂I in SN₂ reactions?
SN₂ reactivity increases with better leaving group ability: CH₃CH₂I > CH₃CH₂Br > CH₃CH₂Cl > CH₃CH₂F .
Ref: NCERT Class 12 Chemistry > Chapter 6: Haloalkanes and Haloarenes > Topic: Classification and Nomenclature and Isomerism of Haloalkanes