3. Based on your Gas Chromatography results, predict the identity of your unknow

Question

3. Based on your Gas Chromatography results, predict the identity of your unknown compound. Write its IUPAC Name.

Results:

2-propanone boiling point 56.05C Retention time 0.525 min

2-Butanone boiling point 79.59C Retention time 0.825 min

2-pentanone boiling point 102.26C Retention time 1.505 min

4-methyl-2-pentanone boiling point 116.5C Retention time 2.290 min

2-Hexanone boiling point 127.6C Retention time 3.455 min

The retention time for my unknown compound was 1.720 min and this could potentially be off by a 10th of a second., What would my unknown compound be based on these results?

Explanation / Answer

The unknown retentiom time falls between 2-pentanone and 4-methyl-2-pentanone. The comound which has a boiling point in between these two molecules is 3,3-dimethyl-2-butanone : b.p. 105 oC and should have retention time somewhere arounf 1.7 min. This unknown here would be this compound. On the other hand If you were supposed to choose the unknown among the compounds whose results are given above, the closest could be 4-methyl-2-pentanone.

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