1.

The electrophile in the sulphonation of arenes isA. `SO_(3)`B. `overset(+)(S)O_(3)`C. `Hoverset(+)(S)O_(3)`D. `HSO_(3)`

Answer» Correct Answer - 1
The electrophile is sulphur trioxide `(SO_(3))` generated in the following manner.
(i) From sulphuric acid.
`2H_(2)SO_(4)toH_(3)O^(+)+HSO_(4)^(-)+SO_(3)`
(ii) From pyrosulphuric acid, often called fuming sulphuric acid:
`H_(2)S_(2)O_(7) or HOSO_(2)OSO_(2)OHtoH^(+)+HSO_(4)^(-)+SO_(3)`
In both the cases `HOSO_(2)O^(-)` acts as a base in the second step.


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