Question

Which of the following is active species in sulphonation of benzene?

• A. $S{O}_3$
• B. $S{O}_3^{+}$
• C. $S{O}_3^{-}$
• D. $HS{O}_4^{+}$

Answer 1

Answer: (A)

Sulphonation of benzene is carried out by $S{O}_3$ (electrophile).