Aluminium (III) chloride forms a dimer becaus | vedclass

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(A) Aluminium chloride $(AlCl_3)$ is an electron-deficient compound with only $6$ electrons in the valence shell of the $Al$ atom. To achieve a stable

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$Al$ can exhibit a higher coordination number.

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(A) Aluminium chloride $(AlCl_3)$ is an electron-deficient compound with only $6$ electrons in the valence shell of the $Al$ atom. To achieve a stable octet configuration,$AlCl_3$ undergoes dimerization to form $Al_2Cl_6$. In this dimer,each $Al$ atom achieves a coordination number of $4$ by forming coordinate bonds with chlorine atoms,thereby completing its octet.

Aluminium $(III)$ chloride forms a dimer because ........

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