Which of the molecule is not hypovalent but complete its octet?

A l C l_{3}

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A l B r_{3}

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A l F_{3}

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B F_{3}

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Solution

The correct option is B $A l F_{3}$
$A l F_{3}$ is not hypovalent but complete its octet.
Al has $3$ valence electrons, which are shared with electrons of $3 F$ atoms. This makes total $6$ valency electrons.
One $F$ atom donates on lone pair of electrons.This completes the octet of $A l$ .

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