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$P C l_{5}$ is well known, but $N C l_{5}$ is not because

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Nitrogen is less reactive than Phosphorus

Nitrogen does not have d-orbitals in it’s valency shell.

Catenation tendency is weaker in nitrogen than Phosphorous

size of Phosphorus is larger than Nitrogen.

answer is B.

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absence of d orbitals do not allow nitrogen to expand its valency

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