Diethyl ether absorbs oxygen to form

Which of the following compounds is obtained when anisole is heated with dilute sulfuric acid?

Methoxyethane on reaction with hot concentrated $HI$ gives

The major product of the following reaction is:

Identify $Z$ in the sequence of reactions :
$CH_3CH_2CH=CH_2$ $\xrightarrow{HBr/H_2O_2} Y$ $\xrightarrow{C_2H_5ONa} Z$

The following is not an appropriate reaction for the preparation of $t$-butyl ethyl ether:
$C_2H_5ONa + CH_3-C(CH_3)_2-Cl \to CH_3-C(CH_3)_2-O-C_2H_5$
$(i)$ What would be the major product of this reaction?
$(ii)$ Write a suitable reaction for the preparation of $t$-butyl ethyl ether.