1. Dismiss Notice
  2. This forum is for support and discussion only. Please promote test prep materials/services (including AMAs) in the Special Offers subforum only. Thanks!
    Dismiss Notice
  3. Guest, be sure to check out How To Get Into Dental School, our free downloadable PDF with step-by-step details for dental school applicants!
    Dismiss Notice

PLEASE help, dimers??

Discussion in 'DAT Discussions' started by 113zami, Jun 17, 2008.

  1. 113zami

    2+ Year Member

    Joined:
    Oct 4, 2007
    Messages:
    141
    Likes Received:
    0
    Status:
    Pre-Dental
    can someone please help me with this question, THANKS

    which molecule is likely to form dimers?

    a)BF3
    b)NO2-
    c)NO2
    d)NO2+

    the correct answer is C , C is a radicle and I can uderstand why it would form dimers but why wouldn't the other choices be able to form dimers?, to my knowledge any 2 molecules can form dimers there isn't really a restriction to forming dimers am i right:confused:
     
  2. theedaddy77

    2+ Year Member

    Joined:
    May 9, 2008
    Messages:
    113
    Likes Received:
    0
    Status:
    Pre-Dental
    wtf is a dimer?
     
  3. 113zami

    2+ Year Member

    Joined:
    Oct 4, 2007
    Messages:
    141
    Likes Received:
    0
    Status:
    Pre-Dental
    a good example would be when 2 molecules capable of forming hydrogen bonds come near each other such as 2 carboxylic acids, when they come near each other and form hydrogen bonds, that's a dimer,
     
  4. theedaddy77

    2+ Year Member

    Joined:
    May 9, 2008
    Messages:
    113
    Likes Received:
    0
    Status:
    Pre-Dental
    a)BF3
    b)NO2-
    c)NO2
    d)NO2+

    For a there is an acid but no base so yeah
    for b it is resonace stablized no reaction
    for c has a loan pair therefor a reaction is possible which allows for dimar to happen
    for d also stable due to resonace.
     
  5. osimsDDS

    5+ Year Member

    Joined:
    Jun 8, 2007
    Messages:
    925
    Likes Received:
    2
    Status:
    Pre-Dental

Share This Page