Alcl3 is dimer.why? Explain
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AlCl3 is a electron deficient species. In order to complete the octet of Aluminum, the molecule dimerize to form Al2Cl6 in which electron are added to aluminum octet by coordinate bond by Chlorine atom as shown in figure below.
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However, the electron deficiency of Aluminium atom in AlCl3 is compensated (completed) by formation of co-ordinate bond between lone pair of Chlorine atom of another AlCl3 molecule and the empty unhybridised p orbital of Aluminium atom, thus forming dimer.
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