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