The major product of the following reaction is: $CH_3CH(OH)CH_3 \xrightarrow{Cu, 573 \ K} ?$

What is used as an antifreeze?

In the reaction sequence:
$\text{Ethanol}$ $\xrightarrow{PCl_5} X$ $\xrightarrow{\text{alc. } KOH} Y$ $\xrightarrow[H_2O, \Delta]{H_2SO_4, \text{room temp.}} Z$
The product $Z$ is:

When ethyl bromide is treated with moist $Ag_2O$,the main product is:

Lucas test is used for:

The alcohol that reacts faster with Lucas reagent is