(i) InBCl3, Boron has 6 electrons in it is outermost orbital and has a vacant p orbital. Thus, it is an electron-deficient compound.
Hence, it acts as Lewis acid and accepts a lone pair of electrons.
(ii) AlCl3 is an electron-deficient compound. Aluminum has three electrons in its valence shell so it forms a covalent compound with chlorine i.e. it forms three single bonds with chlorine.
The octet of Al is not complete by forming such bonds. Thus it can form a coordinate bondto complete its octet.
Hence, AlCl3 acts as a Lewis acid.
Rate this question :