Which product is formed when ethyl alcohol is heated with concentrated $H_2SO_4$?

$HC \equiv CH$ $\xrightarrow[HgSO_4]{H_2SO_4} \,\,$ $\xrightarrow[HOH]{CH_3MgBr} \,\,$ $\xrightarrow{P/Br_2} (X)$; $(X)$ is

The starting material is $butan-2-ol$. The reaction with $H^+/\Delta$ yields $(x)$ possible products,and the subsequent reaction of these products with $Br_2/CCl_4$ yields $(y)$ possible products. Determine the values of $x$ and $y$.

Compare the rate of dehydration of $(i)$,$(ii)$ and $(iii)$ by conc. $H_2SO_4$.

Alcohols are comparatively more soluble in water than hydrocarbons of comparable molecular masses. Explain this fact.

The product $(C)$ in the below mentioned reaction is:
$CH_3-CH_2-CH_2-Br$ $\xrightarrow[\Delta]{KOH_{(alc)}} A$ $\xrightarrow{HBr} B$ $\xrightarrow[KOH_{(aq)}]{\Delta} C$