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  4. Which technique among the following, is most appropriate in separation of a mixture of 100 mg of p-nitrophenol and picric acid ?

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

JEE MainJEE Main 2022Organic Chemistry – Some Basic Principles and Techniques

Solution:

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Solvent polarity has been related to $R_f$ value of nitrocompounds.
$100\, mg$ p-nitrophenol and picric acid have different $R_f$ value on silica gel plate
$\therefore$ Preparative TLC is best to separate $100 \,mg$ of para nitrophenol and picric acid