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The electrophile in the sulphonation of ...

The electrophile in the sulphonation of arenes is

A

`SO_(3)`

B

`overset(+)(S)O_(3)`

C

`Hoverset(+)(S)O_(3)`

D

`HSO_(3)`

Text Solution

Verified by Experts

The correct Answer is:
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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