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Posted by on Monday, July 12, 2010 at 7:34pm.

For fluoracetic acid the highest Boltzmann distribution is when the dihedral angle is at 0 degrees. However, going from chloro- to bromoacetic acid, an increasing dip in the Boltzmann distribution occurs at 0 degrees. What is responsible for this "dip?" (HINT: look at how the structure of the molecule changes as the halogen atom rotates around toward the hydrogen atom attached to the oxygen atom.)


A. Increasing halogen atom size.
B. Decreasing acid strength.
C. Shortening of the C-C bond.
D. Increasing electronegativity.
E. Higher dipole values going from F to Cl to Br.

  • Chemistry - , Monday, November 1, 2010 at 8:47pm

    its not decreasing acid strength
    and its not increasing electronegativity
    GLuckkk!

  • Chemistry - , Monday, November 1, 2010 at 8:49pm

    it's C

  • Chemistry - , Monday, November 1, 2010 at 8:50pm

    my bad answers changed. it's increasing halogen atom size.

  • Chemistry - , Sunday, May 1, 2011 at 12:19pm

    Yep, increasing halogen atom size. Thanks. =)

  • Chemistry - , Monday, July 11, 2011 at 5:52pm

    increasing halogen atom size is correct

  • Chemistry - , Monday, October 31, 2011 at 7:10pm

    increasing halogen size :)

  • Chemistry - , Sunday, April 29, 2012 at 2:11am

    increasing halogen size is right! :)

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