While separating a mixture of ortho and para-nitro phenols by steam distillation, name the isomer which will be steam volatile. Give reasons.

While separating a mixture of ortho and para-nitro phenols by steam distillation, name the isomer which will be steam volatile. Give reasons.
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1 Answer

Answer :

In o-nitrophenol, there is intramolecular hydrogen bonding as follows :

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In p-nitrophenol, there is intramolecular hydrogen bonding as follows :

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Due to intermolecular H bonding in p-nitrophenol, its b. p. is much higher than that of o-nitrophenol. Hence o-nitraphenol due to its lower b. p. is steam volatile while pnitrophenol is not.

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