Final answer:
The C-I bond has the lowest bond dissociation enthalpy among the options C-H, C-F, C-Br, and C-I, since its large atomic radius leads to weaker bonding strength.
Step-by-step explanation:
The Bond Dissociation Enthalpy refers to the amount of energy required to break a specific type of chemical bond at absolute zero. It serves as a measure of the bond strength in a chemical bond. Comparing the bonds C-H, C-F, C-Br, and C-I, the bond with the least bond dissociation enthalpy would be the C-I bond as it requires the least energy to break due to its larger atomic radius which indirectly leads to weaker bonding strength.
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