exam1.txt

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Author:
alyspins
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23655
Filename:
exam1.txt
Updated:
2010-06-15 13:45:41
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ochem
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Description:
chp 12,14,15,16,17 for exam 1 of ochem 2
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  1. For IR, what is located 4000-25000 cm-1
    N-H,O-H, C-H
  2. IR spectra(4000-500)
  3. How does Mass Spectra work?
    gas pushed through waterfall of electrons, causing fragmentation
  4. NMR?
    Looks at carbon-Carbon backbone
  5. What does MS measure?
    • molecular weight
    • charge to mass ratio measured
  6. What is the Base Peak in MS
    • Tallest peak (100 %)
    • most stable peak
  7. What is the parent peak/Molecular ion M+ ?
    Peak representing unfragmented radical cation.
  8. On far right-ignoring blip
    gives molecular weight
  9. Where is C=O on IR
    1670-1780 cm-1
  10. O-H on IR
    3400-3650 cm-1
  11. alkyne IR
    C-H alkyne bond
    • 2100-2260
    • 3300
  12. C=C IR
    RC=CH2
    =C-H
    • 1640-1680
    • 910-990
    • 3020-3100
  13. C=O
    sharp peak 1670-1780
  14. aromatic compunds
    1400-2000
  15. name hydrocarbon aromatic molecules
    • hydrocarbonbenzene
    • ie bromobenzene C6H5Br
    • C6H5 CH2CH2CH3=propylbenzene
  16. Name aromatic ring as substituent
    • phenyl
    • ie 2-phenylheptane
  17. name aromatic ring+CH2 as substituent
    benzyl
  18. Ortho/meta/pera
    adjacent/seperated by 1 C/opposite(sep. by 2C)
  19. Benzene+Br--Fe/catalyst--->?
    bromobenzene+HBr
  20. Heat of hydrogenation
    • more energy=less stable
    • H2 w/ C=C is 118kJ/mol
  21. how prove benzene more stable with hydrogenation
    • benzene (206) vs 3 dbl bond (356)
    • benzene has 150 more stability
  22. benzene structure
    planar, 120, each C is sp2, conjugated
  23. Huckle's rule
    • 4n+2 pi electrons means aromatic stability
    • benzene:4+2=6 b/c 3 dbl bonds=6 pi
  24. anti aromatic
    4n pi electrons
  25. pyridine?
    N in place of one C of benzene
  26. naming alcohols
    • number longest chain
    • start where OH will be lowest number
    • list substituents in alphabetical order
    • replace "e" at end with ol
    • ie2-Methyl-2-pentanol
  27. naming phenols
    • OH attached to benzene ring
    • name substituents on ring based upon position from OH
    • use "phenol" instead of "benzene"
    • benzyl alcohol=phenymethanol
  28. alcohol and phenol properties
    • sp3 hybridized
    • higher boiling point than similar alkanes/ alkyl halides
    • weakly basic/acidic
    • protonated by strong acid to yield oxonium ion

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