Which of the following gives the iodoform test?

Prof. Sandy Gilbert asked his students to prepare $2$-chloropropane by different methods:
Kaushal's method: $CH_3-CH(OH)-CH_3 \xrightarrow{KCl}$
Preeti's method: $CH_3-CH=CH_2 \xrightarrow{Cl_2 + H_2O}$
Raghav's method: $CH_3-CH(OH)-CH_3 \xrightarrow[Pyridine]{SOCl_2}$

Optically active $2-$octanol rapidly loses its optical activity when exposed to

$A$ compound $X$ with molecular formula $C_3H_8O$ can be oxidized to a compound $Y$ with the molecular formula $C_3H_6O_2$. $X$ is most likely to be

The following reaction is known as:
$C_2H_5OH + SOCl_2 \xrightarrow{\text{Pyridine}} C_2H_5Cl + SO_2 + HCl$

Which of the following is the most suitable method for removing the traces of water from ethanol?