Question

Which of the following is the most stable intermediate obtained in chlorination of benzene using `Cl_(2)` and `FeCl_(3)` as catayst ?
A.
B.
C.
D. All are equally stable

Answer 1

Correct Answer - B
The resonance energy of this cation (`sigma`-complex) in (B) is smaller than that of benzene only. In this cation, the new covalent bond with the incoming electrophile has been completely formed. In the other two cations, the new bond is incompletely formed.