(A) The reaction of ethyl alcohol $(C_2H_5OH)$ with thionyl chloride $(SOCl_2)$ is known as the Darzens process. The reaction is: $C_2H_5OH + SOCl_2 \

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(A) The reaction of ethyl alcohol $(C_2H_5OH)$ with thionyl chloride $(SOCl_2)$ is known as the Darzens process. The reaction is: $C_2H_5OH + SOCl_2 \rightarrow C_2H_5Cl + SO_2 + HCl$. This method is preferred because the by-products ($SO_2$ and $HCl$) are gases,which escape,leaving behind pure ethyl chloride.