The mechanism of coupling reaction of diazonium salt with phenol and aromatic amine is _.

Q. The mechanism of coupling reaction of diazonium salt with phenol and aromatic amine is _.

A

Electrophilic addition

B

Electrophilic substitution

C

Nucleophilic addition

D

Nucleophilic substitution

Solution:

Aromatic diazonium ions acts as electrophiles in coupling reactions with activated aromatics such as anilines or phenols.
The substitution normally occurs at the para position, except when this position is already occupied, in which case ortho position is favoured.
The pH of solution is quite important; it must be mildly acidic or neutral, since no reaction takes place if the pH is too low.

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