Question

Identities of the components in a mixture may be determined by a technique called spiking. Suppose you had run a gas chromatogram on your product and had then deliberately added a drop of a known sample of 3-methylcyclohexene to a drop of your product. What would you expect the new chromatogram to show you? 3.

Dehydration of 2-methylcyclohexanol Lab

Answer 1

In analysis of the graph produced by the graph chromatograph, the ratio of the two products produced was about 4 to 1. The product with the higher yield should theoretically be 1-methylcyclohexanol. This is because the double bond in 1-methylcyclohexanol is trisubstituted, which is favored over disubstituted and monosubstitued double bonds according to Zaitsev’s rule. The product with the lower yield should be 3-methylcyclohexanol. The double bond in 3-methylcyclohexanol is only disubstituted, which is less favored. There were a few very small peaks on the graph which may be negligible. However, I think one of them could possibly be representative of methylenecyclohexane, which is the third product formed from the dehydration of 2-methylcyclohexanol. This proportion of this product would be minute and it is usually not observed, so this would be highly unlikely.