Question

in the electrophilic substitution of benzene to restore aromatic character sigma complex releases proton from​

Answer 1

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The sigma complex or the arenium ion releases a proton from the carbon that is sp3 hybridized when AlCl4 attacks it, and this step is necessary to restore the aromatic character. In this third step, the hydrogen is replaced by the electrophile in the benzene ring.

An electrophilic substitution reaction is a chemical reaction in which the functional group attached to a compound is replaced by an electrophile. The displaced functional group is typically a hydrogen atom. Electrophilic substitution reactions generally proceed via a three-step mechanism that involves the following steps.

• The generation of an electrophile ,

• The formation of a carbocation (which is an intermediate) ,

• The removal of a proton from the intermediate.

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Answer 2

Answer:

The sigma complex or the arenium ion releases a proton from the carbon that is sp3 hybridized when AlCl4 attacks it, and this step is necessary to restore the aromatic character. In this third step, the hydrogen is replaced by the electrophile in the benzene ring.