Question

The decreasing order of reactivity towards SE (substitution by electrophile) of the following is :
(I) Nitrobenzene (II) Chlorobenzene
(III)Toluene (IV) Benzene

• A. $\left(I\right)>\left(II\right)>\left(lII\right)>\left(IV\right)$
• B. $\left(IV\right)>\left(lII\right)>\left(II\right)>\left(I\right)$
• C. $\left(lII\right)>\left(IV\right)>\left(II\right)>\left(I\right)$
• D. $\left(I\right)>\left(II\right)>\left(IV\right)>\left(lII\right)$

Answer 1

The correct option is C $\left(lII\right)>\left(IV\right)>\left(II\right)>\left(I\right)$

EDG increases SE reactivity and EWG decreases SE reactivity. (III) $Ph-C{H}_3$ ($+I$ and H.C effect) $>$ (IV) $\left(C_6{H}_6\right)>$ (II) $Ph-Cl(-I$ effect, +R effect, but $-I$ effect decides reactivity, whereas $+R$ effect decides orientation, i.e., o-and p-directing$)>$ (I) $(Ph-N{O}_2)(-I$ and $-R$ effects$)$.