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Understanding Alkenes and Alkynes: Structures, Properties, and Naming

This resource provides notes on alkenes and alkynes, focusing on their structures, properties, and naming conventions. Alkenes, characterized by one or more double bonds and more reactive than alkanes, follow the formula CnH2n and end in "-ene." Alkynes, with at least one triple bond, are more reactive than both alkenes and alkanes, following the formula CnH2n-2 and ending in "-yne." Additionally, the document includes practical examples, molecular structures, and rules for numbering carbon chains to identify the position of substituents.

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Understanding Alkenes and Alkynes: Structures, Properties, and Naming

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  1. Chemistry Chapter 22 Notes #3 Alkenes and Alkynes

  2. review • Draw the following • Nonane • 2,4,7 trimethyl nonane • 2,3 dimethyl 5 propyl decane • 4 isopropyl heptane • Methylcyclopentane • 1,3 diethyl cyclobutane • 1,2,2,4 tetramethylhexane

  3. Alkenes • Unsaturated Hydrocarbons • At least one double bond in the carbon chain • More reactive than alkanes • Formula • CnH2n • To figure out number of Hydrogen's • Names end in –ene • Ex. Ethene

  4. Alkene Examples • Butene • 3,4 dimethyl 2pentene • Why is it numbered that way? • 1,5 octadiene • 4 butyl cyclohexene

  5. Alkynes • Unsaturated Hydrocarbons • At least one triple bond in the carbon chain • More reactive than alkanes and alkenes • Formula • CnH2n - 2 • To figure out number of Hydrogen's • Names end in –yne • Ex. Ethyne

  6. Alkyne Examples • Butyne • 4-heptyne • 4ethyl, 2 methyl, 1 hexyne

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