Question
Which of the following statements about anhydrous aluminium chloride is correct?
A.
it exists as $$AIC{l_3}$$ molecules
B.
it is not easily hydrolysed
C.
it sublimes at $${100^ \circ }$$ under vacuum
D.
it is a strong Lewis base
Answer :
it sublimes at $${100^ \circ }$$ under vacuum
Solution :
$$AlC{l_3}$$ exists as a dimer $$\left( {A{l_2}C{l_6}} \right)$$ . It is a strong Lewis acid as it has an incomplete octet and has a tendency to gain electrons. $$AlC{l_3}$$ undergoes hydrolysis easily and forms an acidic solution.
$$AlC{l_3} + 3{H_2}O \to Al{\left( {OH} \right)_3} + 3HCl\,$$
Option (C) is true that $$AlC{l_3}$$ sublimes at $${100^ \circ }C$$ under vacuum.
$$AlC{l_3}$$ is a Lewis acid.