Which of the following molecules follows octet rule?

X e F_{2}

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S F_{4}

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P C l_{3} F_{2}

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S i C l_{4}

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Solution

The correct option is D $S i C l_{4}$
The octet rule states that atoms are most stable when their valence shells are filled with eight electrons. Here, $S i C l_{4}$ is the only molecule which follows the octet rule while the rest are hypervalent compounds. Hypervalent compound has atoms having more than 8 $e^{-}$ in its valence shell. They violate the octet rule.
$X e F_{2} : 10 e^{-} (X e)$
$S F_{4} : 10 e^{-} (S)$
$P C l_{3} F_{2} : 10 e^{-} (P)$

Lewis structure of the given species are:

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