(A) $AlCl_3$ is an electron-deficient compound because the $Al$ atom has only $6$ electrons in its valence shell. Due to this,it acts as a Lewis acid.

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(A) $AlCl_3$ is an electron-deficient compound because the $Al$ atom has only $6$ electrons in its valence shell. Due to this,it acts as a Lewis acid. In its anhydrous form,$AlCl_3$ exists as a dimer $Al_2Cl_6$ with covalent bonds,where chlorine atoms act as bridges. Therefore,$AlCl_3$ is anhydrous and covalent.