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Question

While separating a mixture of ortho and para nitrophenols by steam distillation, name the isomer which will be steam volatile? Give reason.

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Solution

While separating a mixture of ortho and para nitrophenols by steam distillation, o-nitrophenol will be steam volatile due to presence of intramolecular hydrogen bonds. In case of p-nitrophenol, intermolecular hydrogen bonding is present which results in strong association of molecules. Hence, p-nitrophenol is not steam volatile.
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