The attacking (electrophilic) species in sulp | vedclass

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(B) In the sulphonation of benzene,concentrated sulphuric acid or fuming sulphuric acid $(H_2SO_4 + SO_3)$ is used.Sulphur trioxide $(SO_3)$ acts as t

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$SO_3$

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(B) In the sulphonation of benzene,concentrated sulphuric acid or fuming sulphuric acid $(H_2SO_4 + SO_3)$ is used.Sulphur trioxide $(SO_3)$ acts as the active electrophilic species.It is an electron-deficient molecule that accepts a pair of $\pi$ electrons from the benzene ring to initiate the electrophilic aromatic substitution reaction.

The attacking (electrophilic) species in sulphonation of benzene is

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