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$A l^{+ 3}$ is a Lewis acid, because

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It has vacant orbital

It has completely filled orbitals

It can add with $O H^{-}$

It can give $H^{+}$

answer is A.

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Detailed Solution

$A l^{+ 3}$ has a vacant d orbital so it can accept electron pairs, and also Lewis's acids are electron pair acceptors.

Therefore, the correct answer is option (A) it has a vacant orbital.

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