Alkanes

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Author:
omi14
ID:
123532
Filename:
Alkanes
Updated:
2011-12-13 22:00:05
Tags:
CHM 325 organic chemistry alkane
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Description:
CHM 325 Organice Chemistry
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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?
  4. What is the structure of isopentane?
  5. What is the structure of neopentane?
  6. What is the structure of propyl group?
  7. What is the structure of isopropyl group?
  8. What is the structure of n-butyl group?
  9. What is the structure of sec-butyl group?
  10. What is the structure of isobutyl group?
  11. What is the structure of tert-butyl group?
  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%

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