Isopropyl methyl ether when treated with cold hydrogen iodide $(HI)$ gives -

Which of the following can be prepared effectively by Williamson ether synthesis?

Two isomeric compounds $I$ and $II$ are heated with $HBr$. The products obtained are

The reaction of methyl chloride with silver acetate yields $................$.

The following are possible syntheses of phenyl propyl ether. Which one would work?
$(i)$ $C_6H_5OH$ $\xrightarrow{KNH_2}$ $\xrightarrow{CH_3CH_2CH_2Br}$
(ii) $CH_3CH_2CH_2OH$ $\xrightarrow{NaOH}$ $\xrightarrow{C_6H_5Br}$
(iii) $CH_3CH_2CH_2OH$ $\xrightarrow{NaH}$ $\xrightarrow{C_6H_5Br}$

The reaction of $tert$-butyl methyl ether with one equivalent of $HI$ gives: