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Reactivity order of halides for dehydrohalogenation is                        

(a) R-F>R-Cl>R-Br>R-I

(b) R-I>R-Br>R-Cl>R-F

(c) R-I>R-Cl>R-Br>R-F

(d) R-F>R-I>R-Br>R-Cl