Assertion :The experimentally determined $N - F$ bond length in $N F_{3}$ is greater than the sum of the single bond covalent bond radii of $N$ and $F$ . Reason: $N$ and $F$ both have high electron density due to smaller atomic radii. Thus, $l p - b p$ repulsion increases bond-length.

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 A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
True. $N$ and $F$ both have high electron density due to smaller atomic radii. Thus, lp-bp repulsion increases bond-length.

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Assertion :The experimentally determined N−F bond length in NF3 is greater than the sum of the single bond covalent bond radii of N and F. Reason: N and F both have high electron density due to smaller atomic radii. Thus, lp−bp repulsion increases bond-length.

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.True. N and F both have high electron density due to smaller atomic radii. Thus, lp-bp repulsion increases bond-length.

Assertion :The experimentally determined $N - F$ bond length in $N F_{3}$ is greater than the sum of the single bond covalent bond radii of $N$ and $F$ . Reason: $N$ and $F$ both have high electron density due to smaller atomic radii. Thus, $l p - b p$ repulsion increases bond-length.

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
True. $N$ and $F$ both have high electron density due to smaller atomic radii. Thus, lp-bp repulsion increases bond-length.