Which Reaction Would You Expect to Have the Largest Energy $\Delta$

Multiple Choice

Which reaction would you expect to have the largest energy of activation? $\Delta$ H° (kJ mol^-1)

A) CH₃· + CH₃· $\rightarrow$ CH₃CH₃ -378
B) CH₃· + Br· $\rightarrow$ CH₃Br -130
C) CH₄ + I· $\rightarrow$ CH₃· + HI +142
D) CH₄ + Br· $\rightarrow$ CH₃· + HBr +104
E) CH₄ + Cl· $\rightarrow$ CH₃· + HCl +8