Answer:
Anhydrous calcium chloride cannot be
used for drying ethyl alcohol because it forms an addition compound with the alcohol.
\[4{{C}_{2}}{{H}_{5}}OH+CaC{{l}_{2}}\,(anhydrous)\,\xrightarrow{\,}\,CaC{{l}_{2}}.4{{C}_{2}}{{H}_{5}}OH\]
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