When alcohol vapor is passed over heated reduced copper,the alcohol is converted into an alkene. Which type of alcohol is it?

Ethyl alcohol is heated with conc. $H_2SO_4$. The product formed is

$A$ 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:

The products obtained in the following reaction are:

Consider the following reaction sequence:
$C_6H_5-CH=CH-CHO$ $\xrightarrow[35^{\circ}C]{LiAlH_4} A$ $\xrightarrow[Excess]{CH_3MgBr} B$
Identify $B$ in the reaction.

Identify the product $B$ in the following series of reactions.
$CH_3-CH_2-CH_2-OH$ $\xrightarrow{Al_2 O_3, 623 \ K} A$ $\xrightarrow[(ii) H_2 O]{(i) \text{conc. } H_2 SO_4} B$