1. Not finding help here? Sign up for a free 30min tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

C-F bond length

  1. May 9, 2014 #1

    utkarshakash

    User Avatar
    Gold Member

    1. The problem statement, all variables and given/known data
    Choose correct order of C-F bond length
    A)C-HF2<C-H2F<C-F3
    B)C-F3<C-HF2<C-H2F
    C)C-F3<C-H2F<C-HF3
    D)C-HF2<C-F3<C-H2F


    3. The attempt at a solution

    What factors should I look for while measuring bond lengths?
     
    Last edited: May 9, 2014
  2. jcsd
  3. May 9, 2014 #2

    AGNuke

    User Avatar
    Gold Member

    You can take Lone Pair-Bond pair repulsions, Interaction of H and F (due to their size difference), F F interactions, and probably C-H C-F Bond interaction.
     
  4. May 9, 2014 #3

    utkarshakash

    User Avatar
    Gold Member

    Can you please show through an example?
     
  5. May 9, 2014 #4

    AGNuke

    User Avatar
    Gold Member

    Two C-F bonds will repel each other, thus they will try to maximize their angle, but their repulsion with lone pair is even greater, hence they will be forced to elongate themselves in order to face minimal repulsion from each other and the lone pair.

    Try to work on this.
     
  6. May 10, 2014 #5

    utkarshakash

    User Avatar
    Gold Member

    If I follow through this reasoning, then CF3 will have maximum C-F bond length because it suffers more repulsion as compared to others.
     
  7. May 10, 2014 #6

    AGNuke

    User Avatar
    Gold Member

    Might be. But you should check around the internet for factual data before putting your vote in my "theory".

    See, I am assuming that you are preparing for college entrance exam (JEE).
     
  8. May 10, 2014 #7

    utkarshakash

    User Avatar
    Gold Member

    Yes. I'm preparing for JEE and they won't ask questions where factual data is required. But what I wanted to say is that the correct answer is B) which is just the reverse of what I expected.
     
  9. May 10, 2014 #8

    AGNuke

    User Avatar
    Gold Member

    Well, what can I say, I'd need to dig up some lost info on this one.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted



Similar Discussions: C-F bond length
  1. Bond Length (Replies: 3)

  2. C-O bond and C=C bond. (Replies: 2)

  3. Bond lengths (Replies: 3)

Loading...