JEE MAIN - Chemistry (2024 - 6th April Evening Shift - No. 7)
The correct statement among the following, for a "chromatography" purification method is :
$$\mathrm{R}_f$$ of a polar compound is smaller than that of a non-polar compound.
Non-polar compounds are retained at top and polar compounds come down in column chromatography.
Organic compounds run faster than solvent in the thin layer chromatographic plate.
$$\mathrm{R}_f$$ is an integral value.
Explanation
Organic compounds run slower than solvent in thin layer chromatography. $$\mathrm{R}_{\mathrm{f}}$$ is not an integral value. It is the ratio of distance travelled by the organic compound to that of solvent. $$\mathrm{R}_{\mathrm{f}}$$ value of a polar compound is smaller than that of non-polar compound as the polar compound is retained more by the adsorbent than non-polar compound.
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