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Why nitration of phenol gives only ortho...

Why nitration of phenol gives only ortho and para products ?

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In resonating structures of phenol, electron density is maximum at o- and p-positions. Therefore, nitration gives o- and p- products, e.g.

C-atom having negative charge at o- and p-positions has high electron density. So, nitronium ion (electrophile) prefers to attack at these positions.
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