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Assertion : $o$-Nitrophenol is more volatile than $p$-nitrophenol.
Reason : Intramolecular hydrogen bonding is present in $o$-nitrophenol while intermolecular $\mathrm{H}$ - bonding is in $p$-nitrophenol.
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Reason : Intramolecular hydrogen bonding is present in $o$-nitrophenol while intermolecular $\mathrm{H}$ - bonding is in $p$-nitrophenol.
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If both Assertion and Reason are true and Reason is the correct explanation of Assertion.
p-Nitrophenol has higher boiling point than o-nitrophenol, because intermolecular hydrogen bonding present in $p$-nitrophenol is responsible for it. But intramolecular hydrogen bonding in $o$-nitrophenol does not effect boiling point.
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