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Alkenes and Alkynes
ALKENES AND ALKYNES
Figure 65.
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This is a situation where there are double or triple bonds. These are unsaturated hydrocarbons. An alkane is saturated. An alkene has at least one double bond; an alkyne has a triple carbon bond. What does this mean? It means that a molecule identified as C5H8 can have more than a dozen different molecule shapes associated with it.
According to the rules, the -ene suffix can be an alkene or cycloalkene. The longest chain must include both carbon atoms of the double bonded chain. Numbering starts from the end nearest to a double bonded carbon atom. The double-bonded carbons are labelled number 1 and number 2. The vinyl group is the simplest double bond with C2H3.
