Which of the following steps is not correct in the mechanism of electrophilic substitution of be....

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Which of the following steps is not correct in the
P
mechanism of electrophilic substitution of benzene?
(1) Generation of electrophile like \( \mathrm{X}^{+}, \mathrm{R}^{+}, \mathrm{NO}_{2}^{+} \), etc.
(2) Attack of electrophile resulting in the formation of arenium ion in which one of the carbon is \( \mathrm{sp}^{3} \) hybridised.
(3) Addition of proton on benzene ring to give carbocation.
(4) Removal of proton from \( \mathrm{sp}^{3} \) carbon atom to restore aromatic character.


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