The molecule that deviates from octet rule is

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$MgO$

${CCl}_{4}$

${BF}_{3}$

${NCl}_{3}$

answer is B.

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Detailed Solution

In ${BF}_{3},' F$ ' forms an octet by sharing one electron from ' B '. While ' B' shares its three electrons with three 'F' atoms. So, it has only 6 electrons and is unable to form an octet. So, it deviates from the octet rule.

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