Ethyl alcohol will give ethyl chloride with the help of which of the following?

Find out the major product from the following reaction.

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

Give the structures of $A$,$B$,and $C$ in the following reaction:
$CH_3-CH_2-CH(OH)-CH_3$ $\xrightarrow{Cu, 520 \ K} (A)$ $\xrightarrow{C_2H_5MgBr} (B)$ $\xrightarrow{H_3O^+} (C)$

Which of the following reactions requires an oxidising agent?

Which product is not obtained when $\text{CH}_3\text{CH}_2\text{OH}$ reacts with $\text{H}_2\text{SO}_4$?