Question

AlCl3 behaves as an acid in accordance with
a) Lewis concept
b) Arrhenius concept
c) Bronsted Lowry concept

Answer 1

1 According to lewis concept

AlCl3 is electron deficient. 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)

2 According to Arrhenius concept


Arrhenius concept only explains acid and base on the basis of hyronium and hydroxyl ions and alcl3 has none , it can only be explained on the basis of oxidation no.

3According to Bronsted Lowry concept

Bronsted Lowry theory is proton donar acceptor concept. Substance which donates proton is acid . For example HCl .And proton acceptor is known as base. For example Cl-