When monitoring the reaction by TLC you see that the most benzaldehyde starting

Question

When monitoring the reaction by TLC you see that the most benzaldehyde starting material has an Rf of 0.25. What should you do?

A. Use a greater amount of Ethyl Acetate in relation to the amount of Hexane until the Rf is 0.5

B. Use a greater amount of Hexane in relation to the amount of Ethyl Acetate until the Rf is 0.5

C. Rf value of 0.25 is fine as the product of this reactions the product will be more non-polar than the starting material and will travel further up the TLC plate

A. Use a greater amount of Ethyl Acetate in relation to the amount of Hexane until the Rf is 0.5

Explanation / Answer

Here hexane is the non-polar component of the mixture and ethyl acetate is the polar component. Since the solvent polarity is lower hence benzaldehyde has lower Rf value as it is less soluble in that mixture. On increasing the solvent polarity, the solubility of benzaldehyde will increase and will have a higher Rf value. Hence the option A is correct here.

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