Reactivity order of halides for dehydrologenation is

Question

$R - F > R - Cl > R - Br > R - {\rm I}$

$R - {\rm I} > R - Br > R - Cl > R - F$

$R - {\rm I} > R - Cl > R - Br > R - F$

$R - F > R - {\rm I} > R - Br > R - Cl$

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