Discuss the structure of aluminium chloride.

Explanation

Aluminium chloride exists as a dimer `Al_(2)Cl_(6)` in vapour state and also in organic solvents such as benzene, ether etc.
In `AlCl_(3)`, aluminium atom has only six electrons in its valence shell.
In the formation of dimer, one chlorine atom of one molecule gives a lone pair of electrons to the aluminium atom of the other molecule, which results in the formation of two dative bonds.
Hence, both the aluminium atoms in the dimer get octets and the molecule become stabilized