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Home  >>  JEEMAIN and AIPMT  >>  Chemistry  >>  Hydrocarbons
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Which of the following species participate in sulphonation of benzene ring?

$\begin{array}{1 1}(a)\;H_2SO_4\\(b)\; SO_3\\(c)\;HSO_3\\(d)\;SO_2^-\end{array}$

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Most electrophilic substitution reactions are irreversible but sulphonation is an exception.Treatment of benzene with "oleum"(a solution of $SO_3$ in conc.sulphutic acid) will give the sulphonic acid,the electrophile is sulphur trioxide$(SO_3)$
Hence (b) is the correct answer.
answered Mar 18, 2014 by sreemathi.v
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