Which one of the following reactions will not lead to the desired ether formation in major proportion?
(iso- $\mathrm{Bu} \Rightarrow$ isobutyl, sec $-\mathrm{Bu} \Rightarrow$ sec-butyl, $\mathrm{nPr} \Rightarrow \mathrm{n}-$ propyl, ${ }^{\mathrm{t}} \mathrm{Bu} \Rightarrow$ tert-butyl, $\mathrm{Et} \Rightarrow$ ethyl