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(D) $p-$nitrophenol exhibits intermolecular hydrogen bonding,while picric acid ($2,4,6-$trinitrophenol) exhibits intramolecular hydrogen bonding.Due t

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Preparative $TLC$ (Thin Layer Chromatography)

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(D) $p-$nitrophenol exhibits intermolecular hydrogen bonding,while picric acid ($2,4,6-$trinitrophenol) exhibits intramolecular hydrogen bonding.Due to these differences in hydrogen bonding,they possess different polarities and adsorption characteristics on a stationary phase like silica gel.For a small quantity like $100 \ mg$,chromatographic techniques are highly effective.Preparative $TLC$ is a suitable technique for separating small amounts of mixtures based on differences in their $R_f$ values.

Which technique among the following is most appropriate for the separation of a mixture of $100 \ mg$ of $p-$nitrophenol and picric acid?

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$(a)$ Give uses of chromatography.
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$A$ flask contains a mixture of isohexane and $3-$methylpentane. One of the liquids boils at $63^{\circ}C$ while the other boils at $60^{\circ}C$. What is the best way to separate the two liquids and which one will be distilled out first?

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The latest technique for the purification of organic compounds is

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