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The correct statements among the following, for a "chromatography" purification method is: (1) Organic compounds run faster than solvent in the thin layer chromatographic plate. (2) Non-polar compounds are retained at top and polar compounds come down in column chromatography. (3) Rf of a polar compound is smaller than that of a non-polar compound. (4) Rf is an integral value.

1. (1) and (2) Only
2. (2) and (3) Only
3. (3) Only
4. (1), (2), (3) and (4)

Correct answer: (3) Only

Solution

The statement that the Rf value of a polar compound is smaller than that of a non-polar compound is correct because polar compounds interact more strongly with the stationary phase in chromatography, leading to slower movement compared to non-polar compounds, which travel faster due to weaker interactions.

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