Assertion :R $_{3}$ P = O exists but R $_{3}$ N = O does not exist. Reason: P is more electronegative than N.

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 C Assertion is correct but Reason is incorrect
Nitrogen does not have vacant d-orbitals on its valence shell. Therefore, it cannot extend its covalency to five and dπ−pπ bonding is not possible. As a result, the molecules of R $_{3}$ N = O does not exist.

However, phosphorus and rest of the members of the group 15 have vacant d-orbitals in the valence shell which can be involved in dπ−pπ bonding. Under the circumstances, R $_{3}$ P = O molecule can exist.

The electronegativity of $N (3.0)$ is much higher than $P (2.1)$ .

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Assertion :R3P = O exists but R3N = O does not exist. Reason: P is more electronegative than N.

Assertion :R $_{3}$ P = O exists but R $_{3}$ N = O does not exist. Reason: P is more electronegative than N.