Among the following compounds the decreasing order of reactivity towards electrophilic substitution is

II > I > III > IV

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III > I > II > IV

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IV > I > II > III

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I > II > III > IV

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Solution

The correct option is B
III > I > II > IV

In $- C H_{3}, - O C H_{3}$ and $C F_{3}, C H_{3}$ and $- O C H_{3}$ are electron donating group. Hence, they activate the benzene nucleus. In these, order of activation is $- O C H_{3} > - C H_{3}$ while $- C F_{3}$ group deactivates the benzene nucleus. So, it shows lower rate of electrophilic substiution on benzene ring. Thus, order of electrophilic substitution is

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