The normal boiling point of CCl₄ is 77ºC, whereas that of CBr₄ is 190ºC. Why does CBr₄ have a higher boiling point than CCl₄?

A. CBr₄ molecules are smaller and less massive.
B. CBr₄ molecules have stronger London dispersion forces.
C. CCl₄ molecules have stronger hydrogen bonding.
D. CBr₄ molecules have lower vapor pressure.

Question

07-12-2024
Chemistry

High School

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The normal boiling point of CCl₄ is 77ºC, whereas that of CBr₄ is 190ºC. Why does CBr₄ have a higher boiling point than CCl₄?

A. CBr₄ molecules are smaller and less massive.
B. CBr₄ molecules have stronger London dispersion forces.
C. CCl₄ molecules have stronger hydrogen bonding.
D. CBr₄ molecules have lower vapor pressure.

Answer :

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vamolf vamolf · Answer 1 · 2024-08-26T21:39:07-04:00

Final answer:

CCl4 has a lower boiling point than CBr4 because option 2) CBr4 molecules have stronger London dispersion forces.

Explanation:

The boiling point of a substance is influenced by the type of intermolecular forces present in the molecules. In this case, CBr4 has a higher boiling point than CCl4 because CBr4 molecules have stronger London dispersion forces. London dispersion forces occur between all molecules, but they are stronger in larger molecules with more electrons, like CBr4. These stronger intermolecular forces require more energy to break, resulting in a higher boiling point for CBr4.