Ethyl alcohol exhibits acidic character on reacting with

Which of the following compounds will yield $Propanone$ upon dehydrogenation?

$A$ Grignard reagent $(X)$ on reaction with a carbonyl compound $(Y)$ followed by hydrolysis gives $Z$. $Z$ reacts with conc. $HCl$ at room temperature to give immediate turbidity. $X$ and $Y$ respectively are:

What is Lucas reagent?

To remove last traces of water from alcohol,the metal used is

In the following sequence of reactions,
$C_{3}H_{6}$ $\xrightarrow{H^{+}/H_{2}O} A$ $\xrightarrow[dil. KOH]{KIO} B + C$
The compounds $B$ and $C$ respectively are :