A) \[SO_{3}^{+}\]
B) \[SO_{3}^{2-}\]
C) \[H_{3}^{+}O\]
D) \[S{{O}_{3}}\]
Correct Answer: D
Solution :
The electrophile involved in the sulphonation of benzene is \[S{{O}_{3}}\] . \[2{{H}_{2}}S{{O}_{4}}\xrightarrow{{}}S{{O}_{3}}+{{H}_{2}}{{O}^{+}}+HSO_{4}^{-}\]
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