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Types of Hydrogen Bonding

Which among t...

Question

Which among the following is steam volatile?

A

o-nitrophenol

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B

Aniline

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C

Glycerol

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D

p-nitrophenol

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Solution

The correct option is A o-nitrophenol
Molecules having intermolecular H-bonding have higher boiling points (less volatile) than the molecules having intramolecular H-bonding.
So, due to intramolecular H-bonding, o-nitrophenol is steam volatile whereas, other molecules have intermolecular H-bonding.

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Q. Assertion :While separating a mixture of ortho- and paranitrophenols by steam distillation, name the isomer which will be steam volatile. Reason: o-nitrophenol is steam volatile due to chelation (intramolecular H-bonding) and hence can be separated by stream distillation from p-nitrophenol, which is not steam volatile because of intermolecular H-bonding.

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