Which is not exception to the octet rule?

B F_{3}

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S n C l_{4}

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X e F_{8}

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C l O_{3}

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Solution

The correct option is B $S n C l_{4}$
Sn is forming $4$ bong with $C l$ i.e $8 e^{-}$ Sn has $4 e^{-}$ in its outer most shell by sharing of which it has $8 e^{-}$ which complete its octet and follows octet rule.
Thus it is not exception to octet rule.

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B F_{3}

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