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${PCl}_{5} is well known. but {NCl}_{5} is not. Because.$

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catenation tendency is weaker in nitrogen than phosphorous.

nitrogen is less reactive than phosphorous.

size of phosphorous is larger than nitrogen.

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

answer is B.

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Detailed Solution

PCl₅ forms five bonds by using the d–orbitals to "expand the octet". But NCl₅ 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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