Q48 / 180 · AIIMS 2001 · Chemistry

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.

  • Correct answer
    A
    If both Assertion and Reason are true and Reason is the correct explanation of Assertion.
  • B
    If both Assertion and Reason are true but Reason is not the correct explanation of Assertion.
  • C
    If Assertion is true but Reason is false.
  • D
    If Assertion is false but Reason is true.

Solution

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.

Hence, the correct answer is option: 'A'.

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