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ORGANIC CHEMISTRY LANEY COLLEGE CHEM 12A INSTRUCTOR: S. CORLETT Chapter 9 Learning Objectives and Terminology (Wade) Naming alkynes involves choosing the parent hydrocarbon (the one with the greatest number of carbon containing the triple bond) and changing the ending (- ane ) to - yne ; If the compound has double bonds too, then it’s the parent + en-yne . Alkynes are characterized as either terminal (R-C C-H), with a terminal hydrogren or as internal (R-C C-R), without the hydrogen. Commonly alkynes are called acetylenes. The carbon-carbon double bond is ~1.20 Å long, the shortest for C-C bonds, and is the strongest , 837 kJ/mol (~226 kJ/mol needed to break 1 st pi bond), C-C bond. The hybridization is sp for each carbon and explains the linear geometry about the alkynes carbons. Physical properties such as density (~0.7 g/mL) and bp vary and parallel the corresponding paritally saturated (alkenes) and fully saturated (alkanes) hydrocarbons.
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