Sulphonation

Rarely Tested

$$\text{C}_6\text{H}_6 + \text{Conc. H}_2\text{SO}_4 \text{ (fuming / SO}_3) \xrightarrow{\Delta} \text{C}_6\text{H}_5\text{SO}_3\text{H} + \text{H}_2\text{O}$$

Electrophile: Neutral Sulfur Trioxide ($$\text{SO}_3$$)

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