Which of the following reactions represents the Swarts reaction?

The major product in the following reaction sequence is:

Which of the following reaction$(s)$ can be used for the preparation of alkyl halides?
$I$. $CH_3CH_2OH + HCl \xrightarrow{Anh. ZnCl_2}$
$II$. $CH_3CH_2OH + HCl \rightarrow$
$III$. $(CH_3)_3COH + HCl \rightarrow$
$IV$. $(CH_3)_2CHOH + HCl \xrightarrow{Anh. ZnCl_2}$

$Ph-CH(OH)-CH_3 \xrightarrow{SOCl_2}$ major product

In the given reaction:
$CH_3-CH_2-COOH \xrightarrow[(ii) \ Br_2/\Delta]{(i) \ AgNO_3} [X]$
$[X]$ will be:

In the preparation of $CHCl_3$ from ethanol and bleaching powder,the latter provides: