Question

In a compound electrophilic substitution has occured. The substituent- $E$ are methyl, $- CH _{2} Cl ,- CCl _{3}$ and - CHCl $_{2}$. The correct increasing order towards electrophilic substitution is

• A. $- CH _{3}<- CH _{2} Cl <- CHCl _{2}<- CCl _{3}$
• B. $- CH _{3}<- CHCl _{2}<- CH _{2} Cl <- CCl _{3}$
• C. $- CCl _{3}<- CH _{2} Cl <- CHCl _{2}<- CH _{3}$
• D. $- CCl _{3}<- CHCl _{2}<- CH _{2} Cl <- CH _{3}$

Answer 1

Answer: (D)

Chlorine atoms are strongly negative (show -I effect). They deactivate the ring towards electrophilic reaction.