Ethyl alcohol is industrially prepared from ethylene by

Which factor is effective in the preparation of alcohol from alkene using $Al_2O_3$?

$3, 3-$Dimethyl$-2-$butanol cannot be prepared by:
Choose the correct answer from the options given below :

Consider the following reaction sequence:
$CH_3-CH(OH)-CH_3$ $\xrightarrow{PBr_3} (X)$ $\xrightarrow{Mg} (Y)$ $\xrightarrow{C_2H_4O (epoxide)} (Z)$ $\xrightarrow{H_2O, \Delta} ?$
What is the final product of this reaction?

What are $X$ and $Y$ in the following reactions?
$CH_2O \xrightarrow[(ii) H_3O^+]{(i) X} CH_3(CH_2)_2CH_2OH$
$Y \xrightarrow[(ii) H_3O^+]{(i) C_2H_5MgBr} CH_3CH_2C(CH_3)_2OH$

Show how the following alcohols can be prepared by the reaction of a suitable Grignard reagent with methanal:
$(i)$ $C_6H_5CH_2OH$
$(ii)$ $CH_3CH_2CH(CH_3)CH_2OH$