Which of the following statements is correct?

Options

A. Aluminium chloride (`AlCl_3`) is a Lewis acid because it can donate electrons
B. All the Al-Cl bonds in `Al_2Cl_6` are equivalent
C. Aluminium exists in two polymorphic forms, namely, `alpha - Al_2O_3` and `gamma-Al_2O_3`
D. Anhydrous aluminium chloride can be prepared by heating hydrated salt

Answer

C

Explanation

`AlCl_3` is a Lewis acid because it accepts rather than donating electrons.
The structure of `Al_2Cl_6` is
The terminal bonds are different from the bridge Al-Cl bonds.