General Mechanism of Electrophilic Aromatic Substitution
The electroph...
Question
The electrophilic aromatic substitution proceeds through a:
A
Free radical
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B
Sigma complex
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C
Benzyne
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D
Carbene
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Solution
The correct option is C Sigma complex In electrophilic aromatic substitution, a carbocation is generated which is resonansic stabilized but not aromatic.
This cation is called sigma complex because the electrophile is joined to the benzene ring through a new sigma bond.
The sigma complex wish to regain its aromatic and it may do so by either a reversal of first step or by loss of proton.
Thus, electrophilic aromation substitution proceed through a sigma complex.