Question

The effective electrophile in aromatic. sulphonation is

• A. $H_{2}S{O}_4^{-}$
• B. $S{O}_2$
• C. $S{O}_2^{+}$
• D. $S{O}_3$

Answer 1

Answer: (D)

$2H_{2}S{O}_4\rightleftharpoons \underset{\text{(electrophile of aromatic sulphonation)}}{S{O}_3}+HS{O}_4^{-}+H_3{O}^{+}$