Assertion : $B F_{3}$ is a weaker Lewis acid than $B C l_{3}$ . Reason: The planar $B F_{3}$ molecule is stabilised to a greater extent than $B C l_{3}$ by $B - X$ $π$ -bonding.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Assertion is incorrect but Reason is correct

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
In ${B F}_{3}$ , 2p orbital finds easy to overlap with 2p of fluorine as energy is same. This is not there in chlorine as energy is high

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