PC1 5 is well known, but NC1 5 is not. Because.

Chemistry S and P - Block Elements (S - Block Elements Not In Syllabus ) JEE Main 2022 - P Block Single Correct MCQ

Published by: CGP EDU Academic Team

Published on: August 13, 2026

nitrogen is less reactive than phosphorous.

nitrogen doesn't have d-orbitals in its valence shell.

catenation tendency is weaker in nitrogen than phosphorous.

size of phosphorous is larger than nitrogen.

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The correct answer is:

PC1 5 forms five bonds by using the d-orbitals to "expand the octet". But NC1 5 does not exist because there are no d-orbitals in the valence shell (2 nd shell). Therefore there is no way to expand the octet.

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