Alkanes

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  1. List the names of 1-12 straight chain alkanes
    • methane
    • ethane
    • propane
    • butane
    • pentane
    • hexane
    • heptane
    • octane
    • nonane
    • decane
    • undecane
    • dodecane
  2. What is the structure of n-butane?
    CH3CH2CH2CH3
  3. What is the structure of isobutane?
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  4. What is the structure of isopentane?
    Image Upload 2
  5. What is the structure of neopentane?
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  6. What is the structure of propyl group?
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  7. What is the structure of isopropyl group?
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  8. What is the structure of n-butyl group?
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  9. What is the structure of sec-butyl group?
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  10. What is the structure of isobutyl group?
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  11. What is the structure of tert-butyl group?
    Image Upload 9
  12. Give torsial strain values
    • H/H eclipsed = 1 kcal/mol
    • H/CH3 = 1.3 kcal/mol
    • CH3/CH3 eclipsed = 3.0 kcal/mol
    • CH3/CH3 gauche =0.9 kcal/mol
  13. What are the different types of isomers?
    • Structural isomers vs stereoisomers
    • Stereoisomers: enantiomers vs diastereomers
    • Diastereomers: cis-trans isomers (geometric) vs other diastereomers
  14. How do you calculate specific rotation?
    • [α]=αobserved/(C*l)
    • C = concentration of sample (g/ml)
    • l = length of cell (dm)

    The specific rotation of (+/d) is the |x| of (-/l) and vice versa
  15. How do you use specific rotation to measure purity of a sample?
    • optical purity = o.p. = (observed rotation)/(rotation of pure enantiomer)*100%
    • enantiomeric excess = e.e. = |d-l|/(d+l) = (excess of one enantiomer)/(entire mixture)*100%
Author
ID
123532
Card Set
Alkanes
Description
CHM 325 Organice Chemistry
Updated
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