Q.
In a compound
electrophilic substitution has occurred. The substitute-$E$ 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) $- CCl_{3} < - CHCl_{2} < - CH_{2}Cl < - CH_{3}$
Explanation
(d)
Chlorine atoms are strongly electro negative (show negative inductive effect i.e., $- I$ effect). They deactivate the ring towards electrophilic reaction.
The increasing order of substituent-E towards electrophilic substitution is
$- CCl_{3} < - CHCl_{2} < - CH_{2}Cl < - CH_{3}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.