Ethyl alcohol cannot be dried by anhydrous CaCl2 because
It is soluble in water
Explosion takes place
It reacts with CaCl2
It is insoluble in CaCl2
CaCl2 + 4 C2H5OH →CaCl2. 4 C2H5OH
Anhydrous AlCl3 is used in Friedel – crafts reaction because it is