Question

why AlCl3 acts as lewis acid ? explain structure of AlCl3

Answer 1

In AlCl3, Al is electron deficent it needs 2 electrons to complete octect so it act as lewis acid.AlCl3 usually exist as a dimer to achive octect by bridged Cl atom Electron deficent compounds are lewis acids Electron rich compounds are lewis bases

Answer 2

Dear student pls find your answer.

Electronic configuration of Al is
$1 {s}^{2} 2 {s}^{2} 2 {p}^{6} 3 {s}^{2} 3 {p}^{1}$
The three valence electrons (in 3 rd shell) are used to form bonds with 1 Cl each ( i.e. 3 Cl atoms). In the p orbit, 2 orbitals are vacant due to which it is electron deficient.

According to Lewis, a species is an acid if it is electron deficient and accept lone pair of elections. So AlCl3 is a Lewis acid.

Hope you understand.

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