Which Nucleophilic Substitution Reaction Is Not Likely to Occur?
A) $\rightarrow$

Which nucleophilic substitution reaction is not likely to occur?

A) I ^- + CH₃CH₂-Cl $\rightarrow$ CH₃CH₂-I + Cl ^-
B) I ^- + CH₃CH₂-Br $\rightarrow$ CH₃CH₂-I + Br ^-
C) I ^- + CH₃CH₂-OH $\rightarrow$ CH₃CH₂-I + OH ^-
D) CH₃O ^- + CH₃CH₂-Br $\rightarrow$ CH₃CH₂-OCH₃ + Br ^-
E) OH ^- + CH₃CH₂-Cl $\rightarrow$ CH₃CH₂-OH + Cl ^-