Assertion : $B F_{3}$ molecule is planar but $N F_{3}$ is pyramidal. Reason: N atom is smaller than B.

Read the above assertion and reason and choose the correct option regarding it.

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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Both Assertion and Reason are incorrect

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Solution

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

In $B F_{3}$ , boron is $s p^{2}$ hybridised, so it is trigonal planar. In $N F_{3}$ . nitrogen Is $s p^{3}$ -hybridised due to the presence of one lone pair which distorts the structure slightly and becomes pyramidal from tetrahedral.

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