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) \[R-F>R-I>R-Br>R-Cl\]
Correct Answer: B
Solution :
F, CI, Br and I are the elements of VIIA group. In a group atomic, radii increases from top to bottom and the bond dissociation energy decreases as R ? F > R ? Cl > R ? Br > R ? I So, during dehydrohalogenation R-I bond breaks more easily than R-F bond. Hence, order of reactivity will be- R ? I > R ? Br > R ? Cl > R - F
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