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8.3. Organic chemistry purification and characterization — Chemistry STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 ScienceChemistry8.3. Organic chemistry purification and characterization1 Mark
MCQ
$p-$ nitrophenol and $o-$ nitrophenol are separated by
  • A
    Crystallisation
  • B
    Fractional crystallisation
  • C
    Distillation
  • ✓
    Steam distillation
✓

Answer

Correct option: D.
Steam distillation
d
(d) $o-$ nitro phenol has intra molecular hydrogen bonding, while $p-$ nitrophenol has intermolecular hydrogen bonding (comparitively stronger). Due to this reason, the boiling point of $o-$ nitrophenol is found quite less than that of $p-$ nitrophenol. Hence, $o-$ nitrophenol is steam volatile and can be separated from $p-$ nitrophenol by steam distillation.

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