Which Compound Has the Highest Boiling Point and Why?

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SUMMARY

The compounds C2Br6, C2F6, C2I6, and C2Cl6 are arranged in order of increasing boiling points as follows: C2Cl6 < C2Br6 < C2I6 < C2F6. C2F6 has the highest boiling point due to the presence of dipole-dipole interactions, which are stronger than the London dispersion forces present in the other compounds. The boiling points also correlate with molar mass, where heavier compounds require more energy to break intermolecular forces. The discussion highlights the importance of molecular geometry and electronegativity in determining boiling points.

PREREQUISITES
  • Understanding of intermolecular forces, specifically dipole-dipole interactions and London dispersion forces.
  • Knowledge of molecular geometry and its impact on physical properties.
  • Familiarity with electronegativity and its role in charge distribution within molecules.
  • Basic principles of boiling point determination related to molar mass.
NEXT STEPS
  • Research the effects of molecular geometry on boiling points in various compounds.
  • Study the relationship between electronegativity and intermolecular forces in halogenated compounds.
  • Explore the concept of London dispersion forces in detail, including factors that influence their strength.
  • Investigate the boiling points of other halogenated compounds to compare trends.
USEFUL FOR

Chemistry students, educators, and anyone interested in understanding the factors influencing boiling points of organic compounds, particularly halogenated hydrocarbons.

Jbreezy
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Homework Statement



Arrange compunds in order of increasing boiling points and explain why.
C2Br6,C2F6,C2I6,C2Cl6

Homework Equations





The Attempt at a Solution


I have C2Cl6 < C2Br6 < C2I6 < C2F6

My explanation is as follows. C2F6 is highest because it has dipole dipole forces. Which are stronger then London forces. All the others just posse London forces. So I went by molar mass the heavier the more energy required to reach its boiling point ( to break the London dispersion force.)

Please let me know if I think OK.
 
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I don't think only C2F6 has dipole-dipole force. If you check the electronegativity of halogen versus carbon, I'm certain all of them has skewed charge distribution. But then consider again the geometry of the molecules, and check whether your conclusion is right because all of them is symmetrical in nature.
 

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