Which one of the following does not follow octet rule?

{P F}_{3}

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{B F}_{3}

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{C O}_{2}

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C {C l}_{4}

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Solution

The correct option is C ${B F}_{3}$
${B F}_{3}$ does not follow octet rule because central boron atom is surrounded by 6 electrons. 3 electrons are of B atom and remaining 3 electrons are of 3 F atoms. To satisfy octet rule, 8 electrons are required.
Boron lacks an electron pair. Hence, it also acts as Lewis acid

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