The following cannot be used for the preparation of ethyl chloride from ethyl alcohol 

Given data : It is given to identify which of the following cannot be used for the preparation of ethyl chloride from ethyl alcohol

Explanation

In the vicinity of activating substituents like carbonyls and sulfoxides, $S{O}_{2}C{l}_2$ serves as a reagent in the conversion of $CH$ to $CCl$. 

Alkanes, alkenes, alkynes, aromatics, ethers (such tetrahydrofuran), and epoxides are also chlorinated by it. When utilizing an initiator like $AIBN$, these reactions take place under the influence of free radicals.

Hence , the correct option (C). $S{O}_{2}C{l}_2$.