What is the expected order of elution of n-pentane, 2-butanone, propanoic acid, and n-butanol in column chromatography?

What is the expected order of elution of n-pentane, 2-butanone, propanoic acid, and n-butanol in column chromatography?

• A. n-Pentane → 2-butanone → n-butanol → propanoic acid
• B. n-Pentane → n-butanol → 2-butanone → propanoic acid
• C. Propanoic acid → n-butanol → 2-butanone → n-pentane
• D. Propanoic acid → 2-butanone → n-butanol → n-pentane

Answer: (A)

In column chromatography, the order of elution of compounds is primarily influenced by their polarity and interaction with the stationary phase. Nonpolar compounds tend to elute first, while polar compounds interact more with the stationary phase and elute later. n-Pentane is a nonpolar hydrocarbon and will have the least interaction with the polar stationary phase, allowing it to elute first. Next is 2-butanone, which is a ketone and has some polarity due to its carbonyl functional group, making it more polar than n-pentane. As a result, it will elute after n-pentane but before the more polar compounds. n-Butanol has an alcohol functional group that increases its polarity compared to 2-butanone. It will interact more strongly with the stationary phase and, therefore, will elute after 2-butanone. Finally, propanoic acid, which is a carboxylic acid, is the most polar due to its acidic functional group. Its strong interactions with the stationary phase mean that it will elute last. Overall, the expected order of elution based on increasing polarity and interaction with the stationary phase is n-pentane, followed by 2-butanone, then

In column chromatography, the order of elution of compounds is primarily influenced by their polarity and interaction with the stationary phase. Nonpolar compounds tend to elute first, while polar compounds interact more with the stationary phase and elute later.

n-Pentane is a nonpolar hydrocarbon and will have the least interaction with the polar stationary phase, allowing it to elute first. Next is 2-butanone, which is a ketone and has some polarity due to its carbonyl functional group, making it more polar than n-pentane. As a result, it will elute after n-pentane but before the more polar compounds.

n-Butanol has an alcohol functional group that increases its polarity compared to 2-butanone. It will interact more strongly with the stationary phase and, therefore, will elute after 2-butanone. Finally, propanoic acid, which is a carboxylic acid, is the most polar due to its acidic functional group. Its strong interactions with the stationary phase mean that it will elute last.

Overall, the expected order of elution based on increasing polarity and interaction with the stationary phase is n-pentane, followed by 2-butanone, then