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Chemical Properties of Boron Family

Which of the ...

Question

Which of the following is weakest lewis acid?

B C l_{3}

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A l C l_{3}

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G a C l_{3}

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I n C l_{3}

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Solution

The correct option is D $I n C l_{3}$
The acidic character in a p-block element decreases down the group.
$I n C l_{3}$ is the weakest lewis acid because the stability of forming $+ 3$ oxidation state decreases down the group.

Stability of forming $+ 3$ oxidation state- $A l C l_{3} > G a C l_{3} > I n C l_{3}$ (due to inert pair effect)

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