The reagent used to convert allyl alcohol to acrolein is:

$PCC$ is

Explain the types of reactions given by alcohol compounds with examples.

Explain the dehydration reaction of $2$-methylbutan-$1$-ol with concentrated $H_2SO_4$.

Find the correct order of boiling point among the following:

Consider the following reaction:
$CH_3CH_2OH$ $\xrightarrow{PBr_3} X$ $\xrightarrow{alc. KOH} Y$ $\xrightarrow[(ii) H_2O, \text{heat}]{(i) H_2SO_4, \text{room temperature}} Z$
The product $Z$ is