Question

Why is FeCl3 a Lewis acid?

Answer 1

FeCl3 is a Lewis acid.because it can accept an electron pair from a Lewis base.

Answer 2

$FeCl_3$ has sextet of electrons around it, it can easily accept two electrons

Explanation:

According to the Lewis acid-base theory,

Lewis acid : It is a substance that can accepts a pair of electrons to form a covalent bond.

Lewis-base : It is a substance that can donates a pair of electrons to form a covalent bond.

As $FeCl_3$ has sextet of electrons around it, it can easily accept two electrons and thus is considered as lewis acid.

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