Organic Chemistry Chapter 13: Mass Spectrometry and Infrared Spectroscopy

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Organic Chemistry Chapter 13: Mass Spectrometry and Infrared Spectroscopy
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2013-12-29 18:42:40
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Organic Chemistry Chapter 13 Mass Spectrometry Infrared Spectroscopy
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Organic,Chemistry,II
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Organic Chemistry Chapter 13: Mass Spectrometry and Infrared Spectroscopy
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  1. Hydrocarbons like methane (CH4) and hexane (C6H14), as well as compounds that contain only C, H, and O atoms, always have a molecular ion with an ______ mass.
    even
  2. An ____ molecular ion generally indicates that a compound contains nitrogen.
    odd
  3. Nitrogen rule: A compound that contains an ___ number of N atoms gives an ____ molecular ion.
    odd, odd |or| even, even
  4. When the molecular ion consists of two peaks (M and M+2) in a 3:1 ratio, a ___ atom is present.
    • Chlorine, 
    • which has two common isotopes 35Cl and 37Cl
  5. When the molecular ion consists of two peaks (M and M+2) in a 1:1 ratio, a ___ atom is present.
    • Bromine,
    • which has two common isotopes, 79Br and 81Br.
  6. Carbon, hydrogen, oxygen, nitrogen, sulfur, phosphorus, fluorine, and iodine have ____ major isotope.
    one
  7. What functional groups absorb between 4000-2500 in an IR spectrum?
    • Bonds to hydrogen
    • C-H
    • O-H
    • N-H
  8. What functional groups absorb between 2500-2000  in an IR spectrum?
    • Triple bonds
    • CΞC
    • CΞN
  9. What functional groups absorb between 2000-1500  in an IR spectrum?
    • Double bonds
    • C=C
    • C=O
    • C=N
  10. What functional groups absorb between 1500-400  in an IR spectrum?
    • Single bonds
    • C-C
    • C-O
    • C-N
    • C-X
  11. Important IR Absorptions
    O-H
    • 3600-3200
    • strong, broad
  12. Important IR Absorptions
    N-H
    • 3500-3200
    • medium
  13. Important IR Absorptions
    C-H
    ~3000
  14. Important IR Absorptions
    Csp3 - H
    • 3000-2850
    • strong
  15. Important IR Absorptions
    Csp2 - H
    • 3150-3000
    • medium
  16. Important IR Absorptions
    Csp - H
    • 3300
    • medium
  17. Important IR Absorptions
    CΞC
    • 2250
    • medium
  18. Important IR Absorptions
    CΞN
    • 2250
    • medium
  19. Important IR Absorptions
    C=O
    • 1800-1650 (often ~1700)
    • strong
  20. Important IR Absorptions
    C=C
    • 1650
    • medium
  21. Important IR Absorptions
    aromatic ring
    1600, 1500 medium

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