What are $X$ and $Y$ in the following reaction?

Which one of the following methods is used to prepare $Me_{3}COEt$ with a good yield?

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.

Give the reaction of $CH_3-C(CH_3)_2-OCH_3$ with the following:
$(i)$ Anhydrous $HI$ in ether
$(ii)$ Concentrated $HI$

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 reactions will not yield an alkyl halide?