Question

Increasing order of the following for electrophilic substitution reaction as :

• A. I < II < III
• B. III < II < I
• C. II < III < I
• D. I < III < II

Answer 1

The correct option is B III < II < I

The order of reactivity of the benzene rings toward the electrophilic substitution when it is substituted with a activating group increases as the substituents on the ring are groups that donate electrons.$-C{H}_3$ is an activating group which makes benzene more reactive towards electrophile while $-COOH$ is a deactivating group which makes it less reactive. The order reactivity towards the eletrophilic substitution of the compounds $Toluene\left(I\right)>benzene\left(II\right)>Benzoicacid\left(III\right)$