In $CH_3CH_2OH$,which bond dissociates heterolytically?

In which of the following reactions of alcohol is there no cleavage of the $C-O$ bond?

Lucas test is associated with

Alcohols of low molecular weight are

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

In the following sequence of reactions,the compound $C$ formed will be:
$CH_3-CH(NH_2)-CH_3$ $\xrightarrow{HNO_2} A$ $\xrightarrow{\text{Oxidation}} B$ $\xrightarrow[(ii) H^+/H_2O]{(i) CH_3MgI} C$