1.

Which of the following is a Lewis acid ?

Answer»

`AlCl_3`
`MgCl_2`
`CaCl_2`
`BaCl_2`

Solution :Lewis acids are the species in which octet is not complete and ready to accept electrons. In `AlCl_3`, Al is SURROUNDED by 6 electrons and all THREE Cl ATOMS are surrounded by 8 electrons, therefore, `AlCl_3` is electron accepter. It is a covalent compound.
`._13Al`= 2,8,3 and `._17Cl`=2,8,7
`underset"Octet incomplete"(overset(Cl)overset|(Cl-Al-Cl))`


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