Which of the following ethers will undergo electrophilic substitution reaction?

The compound $CH_3-O-C(CH_3)_3$ is prepared best by the reaction:

An organic compound with the molecular formula $C_4H_{10}O$ does not react with sodium metal. Upon reaction with excess $HI$,it yields only two types of halides. Identify the compound.

In the reaction $CH_3-CH(CH_3)-CH_2-O-CH_2-CH_3 + HI \xrightarrow{\text{Heated}} \dots$,which of the following compounds will be formed?

Which of the reactants given below is/are suitable for the preparation of Methoxybenzene?
$(x)$ $C_6H_5Br + CH_3ONa$
$(y)$ $C_6H_5ONa + CH_3Br$

Assertion : Iodide ion combines with smaller group to avoid steric hindrance.
Reason : With $HI$,anisole gives iodobenzene and methyl alcohol.