Question

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

Answer 1

ANSWER,
SO3

MARK BRAINLIEST

Answer 2

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