Q. Arrange the following compounds in order of their decreasing reactivity with an electrophile, $E^{\oplus}$. (A) Chlorobenzene, (B) 2,4-dinitrochlorobenzene, (C)$\ p$-nitrochlorobenzene
A) C>B>A
B) B>C>A
C) A>C>B
D) A>B>C
Explanation
(c)
Chlorobenzene has only one deactivating group, $.e.,$ $- Cl$. In 2, 4-dinitrochlorobenzene three deactivating group, $i.e.,$ two $–NO_{2}$ and one $–Cl$ are present and $p -$nitrochlorobenzene two deactivation groups, $i.e.,$ one $NO_{2}$and one Cl is present. So, the order of reactivity is A>C>B.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.