The Boiling Point of CH₃CH₂Br (Bromoethane) Is 38

The boiling point of CH₃CH₂Br (bromoethane) is 38.4 °C whereas the boiling point of CH₃CH₂I (iodoethane) is 71.5 °C.  Which of the following best explains the difference between the boiling points of the two alkyl halides?

A) The C-Br bond in bromoethane requires less energy to break than the C-I bond in iodoethane.
B) The bromine atom in bromoethane is more polarizable than the iodine atom in iodoethane.
C) The C-Br bond in bromoethane is more polar than the C-I bond in iodoethane.
D) Iodoethane has greater London dispersion forces than bromoethane.

Correct Answer:

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