Alkene: Structure and Reactivity. Chapter 6. Alkenes. An alkene (also called an olefin ) is a hydrocarbon with a carbon-carbon double bond. Alkenes are present in most organic and biological molecules. Examples of Alkenes. Testosterone. b -Carotene. Calculating Degrees of Unsaturation.
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All of these are C6H10
C6H2(6)+2 = 14
14 – 10 = 4 hydrogens
4 hydrogens / 2 = 2 degrees of unsaturation (answer)
C = H,O,O
O = C,C
The Heats of Hydrogenation is a determination of the relative stabilities of cis and trans isomers without looking at equilibrium positions. Alkyl groups are better than H.
In a reaction involving a carbocation, the transition states look like the intermediate.