Question

Which of the following statements is correct?

• A. Boiling point of $o-$nitrophenol is less than boiling point of $p-$nitrophenol
• B. Boiling point of $p-$nitrophenol is less than boiling point of $o-$ nitrophenol
• C. boiling point of both $p-$ nitrophenol and $o-$ nitrophenol are same
• D. Can't predict

Answer 1

The correct option is A Boiling point of $o-$nitrophenol is less than boiling point of $p-$nitrophenol


$o-$nitrophenol has intramolecular hydrogen bonding $p-$nitrophenol has intermolecular hydrogen bonding intermolecular hydrogen bonding leads to a molecular association. This increases boiling point. Hence, $o-$nitrophenol has a lower boiling point than $p-$ nitrophenol