Which product is formed when sodium phenoxide is heated with ethyl iodide?

In Williamson synthesis,ethoxyethane is prepared by:

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

Consider the following reaction: $CH_3-C(CH_3)_2-O-CH_3 \xrightarrow{HI (1 \text{ mole})} \text{Products}$. The main products of the reaction will be:

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

Which of the following procedures would be best for the preparation of phenyl benzyl ether? $C_6H_5OCH_2C_6H_5$