A) \[HSO_{4}^{-}\]
B) Dil \[{{H}_{2}}S{{O}_{4}}\]
C) \[S{{O}_{2}}\]
D) \[S{{O}_{3}}\]
Correct Answer: D
Solution :
\[S{{O}_{3}}\] is involved in sulphonation of aromatic hydrocarbons. \[2{{H}_{2}}S{{O}_{4}}\underset{\begin{smallmatrix} \,\,\,\,(sulphur \\ \,\,\,tri\text{ }oxide \\ electrophile) \end{smallmatrix}}{\mathop{S{{O}_{3}}}}\,+{{H}_{3}}{{O}^{+}}+HSO_{4}^{-}\]
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