Question

The boiling point of $p$-nitrophenol is higher than that of $o$-nitrophenol because

• A. intramolecular hydrogen bonding exists in $p$-nitrophenol
• B. $-NO_2$ group at $p$-position behaves in a different way from that at $o$-position
• C. $p$-nitrophenol has a higher molecular weight than $o$-nitrophenol
• D. there is intermolecular hydrogen bonding in $p$-nitrophenol

Answer 1

Answer: (D)

there is intermolecular hydrogen bonding in $p$-nitrophenol

Answer 2

$p$-Nitrophenol has intermolecular hydrogen bonding so it has more boiling point and less volatile than $o$-nitrophenol which has intramolecular hydrogen bonding.