Question

why AlCl3 is considered as a lewis acid ? Deaw atomic structure of AlCl3?

Answer 1

AlCl3 is cinsideted as a lewis acid because it has three electrons in its valence shell. So when it forms a covalent compound with chlorine it forms three single bonds with chlorine. It doesn't form an octet by doing so thus it can take two more electrons by forming a coordinate bond to become an octet and thus it behaves as Lewis acid. (Lewis acid is defined as compound which can take electron from a donor compound)