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Structural Isomers

C - C - C - C - C - C - C. C. C. C. C - C - C - C - C - C - C - C. C. C. Structural Isomers. Name, draw, and construct structural models of alkanes Include : branched alkanes , structural isomers Additional KEY Terms cycloalkanes. Structural isomers :

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Structural Isomers

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  1. C - C - C - C - C - C - C C C C C - C - C - C - C - C - C - C C C Structural Isomers

  2. Name, draw, and construct structural models of alkanes • Include: branchedalkanes, structuralisomers • Additional KEY Terms • cycloalkanes

  3. Structural isomers: Compounds with samemolecular formulabut different structural formula. Isomers differ in their properties such as boiling point and melting point. More branched the structure, lowerits boiling point - compounds can’t stack, weaker the IMFs. unbranched branched

  4. C4H10 isomers butane 2-methylpropane

  5. C - C - C - C - C - C - C C C C C - C - C - C - C C C More carbon atoms - more structural isomers. Octane - 18 different structural isomers Decane - 75 Eicosane - 366 319 (20 carbon alkane) C C C decane 3-methyl-5-ethylheptane

  6. Draw and name 2 structural isomers of pentane. C - C - C - C 2-methylbutane 2,2-dimethylpropane C - C - C - C C C C C C - C - C - C C - C - C 2-methylbutane pentane Take care when naming your isomers to be sure you don’t have the same thing. C

  7. 3-ethyl-2-methylhexane is a structural isomer of which straight chained alkane? hexane ethyl methyl 6 carbons + 2 carbons + 1 carbon = 9 carbons The alkane with 9 carbons is nonane. C C C C - C - C - C - C - C 1 2 3 4 5 6

  8. CYCLOALKANES • Same naming rules – but add prefix“cyclo” • Name the carbon ring first, then number the carbons so as to give the alkyl groups the lowest set of numbers. C C cyclohexane C C C C C C C C C C C 1-methylcyclobutane C C C C C 1,2-dimethylcyclopentane

  9. CAN YOU / HAVE YOU? • Name, draw, and construct structural models of alkanes • Include: branchedalkanes, structuralisomers • Additional KEY Terms • cycloalkanes

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