______ has the highest rate of reaction towards nucleophilic substitution
Answer & explanation
Correct answer: option 2
The correct answer is option 2. 
Electron withdrawing group \((–NO_2)\) increases the reactivity towards nucleophilic substitution reaction. Also, we know, \(-NO_2\) is an ortho-, para-directing group, and hence option 2 has the highest rate of reaction towards nucleophilic substitution.
