Which of the following is soluble in water?

The major product $[B]$ in the following reaction is:
$CH_3-CH_2-CH(CH_3)-CH_2-O-CH_2-CH_3$ $\xrightarrow[Heat]{HI} [A] (alcohol)$ $\xrightarrow[\Delta]{H_2SO_4} [B]$

$X + HCl$ $\xrightarrow[\text{Addition}]{\text{Anhy. } AlCl_3} C_2H_5Cl \xleftarrow[\text{Substitution}]{\text{Anhy. } ZnCl_2/HCl} Y$. The conversion of $Y$ to $X$ can be achieved by heating with .......... at .......... temperature.

The product $A$ in the following reaction is

Which compound has the highest boiling point?

Alcohols of low molecular weight are