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Reactivity order of halides for dehydrohalogenation is:
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The correct answer is:
R-I $>$ R-Br $>$ R-Cl $>$ R-F
The alkyl halides are very reactive due to highly polarized $\mathrm{R}-\mathrm{X}$ bonds with a large difference in electronegativities of carbon and halogen atoms. Thus, reactivity of $\mathrm{R}-\mathrm{X}$ depends on bond length.More be the bond length, easier for the $\mathrm{R}-\mathrm{X}$ to go for dehydrohalogenation.
Related Theory
Halogens increase in reactivity from the bottom to the top of their Group.
Related Theory
Halogens increase in reactivity from the bottom to the top of their Group.
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