Anhydrous magnesium chloride cannot be prepared by heating hydrated magnesium chloride. Why ?

Ammonia cannot be dried over anhydrous calcium chloride. Why?

Hydrated magnesium chloride, on strong heating gives finally

Potassium carbonate cannot be prepared by Solvey process. Why?

Anhydrous aluminium chloride fumes in air. Give reasons.

How hydrogen chloride is prepared in the laboratory ?

Friedel-Crafts alkylation and acylation are useful in the preparation of certain compounds which cannot be prepared by other methods Benzene is heated with n-butyl chloride in presence of AlCl_3 . The product is

Williamson's synthesis cannot be carried out with tertiary alkyl chloride. Why?