Aluminium (III) chloride forms a dimer becaus | vedclass

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(A) $AlCl_3$ forms a dimer and exists as $Al_2Cl_6$ to achieve a higher coordination number of $6$ for the aluminium atom.In $AlCl_3$,the aluminium at

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Higher coordination number can be achieved by aluminium

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(A) $AlCl_3$ forms a dimer and exists as $Al_2Cl_6$ to achieve a higher coordination number of $6$ for the aluminium atom.In $AlCl_3$,the aluminium atom is electron-deficient with an incomplete octet.By forming a dimer,each aluminium atom accepts a lone pair of electrons from a chlorine atom of another $AlCl_3$ molecule,thereby completing its octet and increasing its coordination number.

Aluminium $(III)$ chloride forms a dimer because

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