Treatment of a $2^{\circ} \text{ alcohol}$ with $CrO_3/H_2SO_4$ yields a/an

Explain the reactions of alcohols involving the cleavage of $C-H$ and $O-H$ bonds with examples.

Ethanol is converted into ethoxyethane by:

In the following sequence of reaction,$Z$ $\xrightarrow{PCl_5} X$ $\xrightarrow[\Delta]{\text{Alc. KOH}} Y$ $\xrightarrow{H_2O/H^{+}} Z$ (Major),$Z$ is:

At room temperature,the alcohol that does not react with Lucas reagent is:

The major product is: