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 :
\[F,\,\,Cl,\,\,Br\]and \[I\] are the elements of VII A 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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