Question

A student made a mistake in the experiment and ended up with some unreacted 2-methylcyclohexanol in...

A student made a mistake in the experiment and ended up with some unreacted 2-methylcyclohexanol in their product. Where would you see this in the GC chromatogram? (Would it have a longer or shorter RT? Explain why).

Homework Answers

Answer #1

Answer:             Longer RT (Retention Time)

Polar compounds will have a longer elution time on a polar column (i.e. the stationary phase) while a nonpolar compound will elute in shorter times. Polar compounds present in mobile phase (gas phase) passing through will be adsorbed (Surface phenomenon) on stationary phase compare to non-polar compounds. Hence we will observe a longer retention times for such compounds since stationary phase slowly releases polar compounds as they are attached temporarily to it.

Since you have not provided starting compound i cannot compare with 2-methylcyclohexanol it without knowing starting compound polarity.The various compounds in the sample will separate and result in the appearance of peaks at different locations on your chromatogram according to their molecular weight and its polarity.

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