Which one of the following reagents is not suitable for the elimination reaction?

To get the desired product, an elimination reaction needs to occur.

For an elimination reaction, a strong base $\left(\stackrel{-}{\text{O}}\text{Et,}\stackrel{-}{\text{O}}\text{H}\right)$ needed. Because ${\text{I}}^{-}$ is not basic, $\text{NaI}$ is not suitable for the following reaction.



With $\mathrm{N}\mathrm{a}\mathrm{I,}$ substitution takes place.