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Aluminium chloride exists as dimer. Give...

Aluminium chloride exists as dimer. Give reason.

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In `AlCl_(3)`, Al has only six electrons in the valence shell. Therefore it needs two more electrons to complete its octet. To do so, it accept a lone pair of electrons from the Cl atom of another `AlCl_(3)` molecule as shown. As a result , `AlCl_(3)` exiss as a dimer.
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