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Organic Acidity/Basicity trends

Discussion in 'Pre-Dental' started by DesiDentist, Jul 27, 2002.

  1. DesiDentist

    DesiDentist G. S. Khurana, DMD, MBA Moderator Emeritus Exhibitor 10+ Year Member

    1,573
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    Jul 21, 2001
    Washington, DC
    SDN Exhibitor
    I was wondering if anyone has any useful suggestions/hints on problems in Ochem concerning acidity/basicity. I believe the DAT tests on this topic and I was trying to find like a chart or something that explains all the rules. If anyone can share their insight that would be wonderful.

    Also, if you could mention the types of problems you encountered on the DAT that would really help me focus, as there is a whole bunch of stuff I have to remember.

    Thanks,

    DesiDentist
     
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  3. vixen

    vixen I like members 10+ Year Member

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    Oct 17, 2000
    upstate ny
    I remember I had some ranking questions, like rank in order of increasing acidity.
     
  4. vixen

    vixen I like members 10+ Year Member

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    Oct 17, 2000
    upstate ny
    electron withdrawing groups: increase acidity (decreasing basicity),
    electron donating groups: decrease acidity, increase basicity,

    where on the molecule makes a difference also...

    like if you had:

    CH3-CH2-CH2-CH3

    CH2Cl-CH2-CH2-CH2Cl

    CH3-CH2-CH2-CHCl2 this would be the most acidic, then the previous, then the first.


    That's about it for now.
     
  5. Dentalstu02

    Dentalstu02 Member 7+ Year Member

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    Jun 24, 2002
    One thing that is important is the fact that the more electronegative the molecules are on a compund the more acidic it will be. However, the exception to this are the Halogens, which increase in acidity down the column.
    HF is less acidic than HCl etc..
     
  6. sallycinnamon

    sallycinnamon Member 7+ Year Member

    26
    1
    Sep 4, 2001
    Boston
    hi there,

    this is what i have from my orgo notes: BEAN
    the rectangle is the PT
    B = Basicity (highest)
    E = Electronegativity (Highest, F = 4.0)
    A = Acidity (highest)
    N = Nothing

    B _____________E
    l l
    l l
    L____________l
    N A

    hope this helps :)
    g'luck!
    - sallyC!
     

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