What is the order of reactivity of halogens in free radical halogenation of alkanes?
Reactivity in free radical halogenation decreases with bond strength: F₂ > Cl₂ > Br₂ > I₂ .
Ref: NCERT Class 12 Chemistry > Chapter 6: Haloalkanes and Haloarenes > Topic: Nucleophilic Substitution Reactions - SN1 and SN2 Mechanisms