Which of the following species participate in sulphonation of benzene ring ?

Question

Which of the following species participate in sulphonation of benzene ring ? (A) H2SO4 (B) SO3 (C) HSO3- (D) SO2-

Tardigrade Admin · Accepted Answer

Most electrophilic substitution reactions are irreversible but sulphonation is an exception. Treatment of benzene with "oleum" (a solution of SO3 in conc. sulphuric acid) will give the sulphonic acid, the electrophile is sulphur trioxide (SO3 ).

Q. Which of the following species participate in sulphonation of benzene ring ?

$H_{2} S O_{4}$

$S O_{3}$

$H S O_{3}^{-}$

$S O_{2}^{-}$

Most electrophilic substitution reactions are irreversible but sulphonation is an exception. Treatment of benzene with "oleum" (a solution of $S O_{3}$ in conc. sulphuric acid) will give the sulphonic acid, the electrophile is sulphur trioxide ( $S O_{3}$ ).

Q. Which of the following species participate in sulphonation of benzene ring ?

H2​SO4​

SO3​

HSO3−​

SO2−​

Most electrophilic substitution reactions are irreversible but sulphonation is an exception. Treatment of benzene with "oleum" (a solution of SO3​ in conc. sulphuric acid) will give the sulphonic acid, the electrophile is sulphur trioxide (SO3​ ).

$H_{2} S O_{4}$

$S O_{3}$

$H S O_{3}^{-}$

$S O_{2}^{-}$

Most electrophilic substitution reactions are irreversible but sulphonation is an exception. Treatment of benzene with "oleum" (a solution of $S O_{3}$ in conc. sulphuric acid) will give the sulphonic acid, the electrophile is sulphur trioxide ( $S O_{3}$ ).