How the formation of peroxides in ethers can be detected and prevented?

Give reasons for the following:

The reactivity of halogen acids with ethers is $\mathrm{HI}>\mathrm{HBr}>\mathrm{HCl}$.

Give reasons for the following:

Phenyl methyl ether reacts with $\mathrm{HI}$ to give phenol and methyl iodide and not iodobenzene and methyl alcohol. Explain by using the chemical reaction involved.

Write the names of reagents and chemical equations for the preparation of the following ethers by Williamson's synthesis.

Ethoxyethane

Write the names of reagents and chemical equations for the preparation of the following ethers by Williamson's synthesis.

Ethoxybenzene

Write the names of reagents and chemical equations for the preparation of the following ethers by Williamson's synthesis.

$1$-Propoxypropane

Write the names of reagents and chemical equations for the preparation of the following ethers by Williamson's synthesis.

$2$-Methyl-$2$-methoxypropane.