Which among the following is the correct decreasing order of covalent character?

A l B r_{3} > A l F_{3} > A l C l_{3}

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A l B r_{3} > A l C l_{3} > A l F_{3}

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A l F_{3} > A l C l_{3} > A l B r_{3}

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A l C l_{3} > A l F_{3} > A l B r_{3}

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Solution

The correct option is B $A l B r_{3} > A l C l_{3} > A l F_{3}$
Fajan's rule:
$Polarisiblity \propto Covalent character \propto \frac{charge of ions}{size of anion}$

Greater the size of the anion, more will be the polarisability and hence, more would be the covalent character.

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