1. SDN Mobile is now free on iTunes and on the Google Play Store. Enjoy!
    Dismiss Notice
  2. Dismiss Notice
  3. 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
  4. 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

degrees of unsaturation confusion

Discussion in 'DAT Discussions' started by DentalLonghorn2014, Aug 15, 2015.

  1. DentalLonghorn2014

    2+ Year Member

    Joined:
    Dec 11, 2013
    Messages:
    1,475
    Likes Received:
    1,079
    Status:
    Pre-Dental
    Hey y'all!

    So, I'm a little confused with determining the degrees of unsaturation.

    I understand that Carbon will have 10 hydrogens for saturation
    but what about C4H8? You are missing 2 hydrogens. Is that 1 or 2 degrees of unsat?

    If so, what about C4H7N?
    The total saturation is C4H11N because you add an H for every N...but Chad says that it is 2 degrees of unsaturation. How? You have an extra H added to make it 11 H instead of the usual 10.

    I apologize if I sound frantic lol
     
    Stop hovering to collapse... Click to collapse... Hover to expand... Click to expand...
  2. Lnguyen7

    2+ Year Member

    Joined:
    Jan 9, 2015
    Messages:
    126
    Likes Received:
    34
    You can use this formula to determine the DOU
    DOU = 1/2(2C + 2 + N - H - X)
    X = halogen
    You ignore Oxygen
    For C4H8: DOU = 1/2(2*4 + 2 - 0 - 8 - 0) = 1
    For C4H7N: DOU = 1/2(2*4 + 2 + 1 - 7 - 0) = 2
     
    DentalLonghorn2014 likes this.
  3. nornton

    2+ Year Member

    Joined:
    Jul 19, 2015
    Messages:
    55
    Likes Received:
    16
    Status:
    Dental Student
    For C4H8 that will be 1 degree of unsaturation (1 degree = missing 2 hydrogens). For C4H7N you add 1 H for N so the total number of hydrogens would be 11 if it was unsaturated. You have 7 hydrogens so that is 2 degrees of unsaturation (11-7=4 missing hydrogens).
     
    DentalLonghorn2014 likes this.
  4. OP
    OP
    DentalLonghorn2014

    2+ Year Member

    Joined:
    Dec 11, 2013
    Messages:
    1,475
    Likes Received:
    1,079
    Status:
    Pre-Dental
    Thank you very much everyone!
     
    Stop hovering to collapse... Click to collapse... Hover to expand... Click to expand...

Share This Page