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  4. Which one of the following does not follow octate rule?

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Q. Which one of the following does not follow octate rule?

BITSATBITSAT 2015

Solution:

$BF _{3}$ 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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